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agreement.","units":{"USD":[{"end":"2015-12-31","val":38000000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-03-31","val":118200000,"accn":"0001412232-16-000125","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":74100000,"accn":"0001412232-16-000153","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":65100000,"accn":"0001412232-16-000171","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03","frame":"CY2016Q3I"},{"end":"2016-12-31","val":195500000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"},{"end":"2017-03-31","val":325900000,"accn":"0001412232-17-000056","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-05","frame":"CY2017Q1I"},{"end":"2017-06-30","val":321000000,"accn":"0001412232-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":247600000,"accn":"0001412232-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"}]}},"LineOfCreditFacilityCurrentBorrowingCapacity":{"label":"Line 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facility.","units":{"USD":[{"end":"2015-12-31","val":425000000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-03-31","val":417600000,"accn":"0001412232-16-000125","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":425000000,"accn":"0001412232-16-000153","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":425000000,"accn":"0001412232-16-000171","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03","frame":"CY2016Q3I"},{"end":"2016-12-31","val":425000000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"},{"end":"2017-03-31","val":422700000,"accn":"0001412232-17-000056","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-05","frame":"CY2017Q1I"},{"end":"2017-06-30","val":425000000,"accn":"0001412232-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":425000000,"accn":"0001412232-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"}]}},"LineOfCreditFacilityMaximumBorrowingCapacity":{"label":"Line of Credit Facility, Maximum Borrowing Capacity","description":"Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the 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of Credit Facility, Remaining Borrowing Capacity","description":"Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings 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Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2015-12-31","val":1989000000,"accn":"0001412232-16-000171","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03"},{"end":"2015-12-31","val":1989000000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-09-30","val":2017600000,"accn":"0001412232-16-000171","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03","frame":"CY2016Q3I"},{"end":"2016-12-31","val":2017000000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"end":"2016-12-31","val":2017000000,"accn":"0001412232-17-000056","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-05"},{"end":"2016-12-31","val":2017000000,"accn":"0001412232-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31"},{"end":"2016-12-31","val":2017000000,"accn":"0001412232-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2016Q4I"},{"end":"2017-03-31","val":2181000000,"accn":"0001412232-17-000056","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-05","frame":"CY2017Q1I"},{"end":"2017-06-30","val":2228800000,"accn":"0001412232-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":2180000000,"accn":"0001412232-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"}]}},"LongTermDebtAndCapitalLeaseObligations":{"label":"Long-term Debt and Lease Obligation","description":"Amount of long-term debt and lease obligation, classified as noncurrent.","units":{"USD":[{"end":"2013-12-31","val":2783400000,"accn":"0001412232-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"end":"2013-12-31","val":2783400000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2013Q4I"},{"end":"2014-09-30","val":2693000000,"accn":"0001412232-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"},{"end":"2014-12-31","val":2016600000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04"},{"end":"2014-12-31","val":2016600000,"accn":"0001412232-15-000013","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14"},{"end":"2014-12-31","val":2016600000,"accn":"0001412232-15-000021","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-12"},{"end":"2014-12-31","val":2016600000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2014Q4I"},{"end":"2015-03-31","val":2042200000,"accn":"0001412232-15-000013","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1938200000,"accn":"0001412232-15-000021","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-12","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1952500000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"}]}},"LongTermDebtAndCapitalLeaseObligationsCurrent":{"label":"Long-term Debt and Lease Obligation, Current","description":"Amount of long-term debt and lease obligation, classified as current.","units":{"USD":[{"end":"2013-12-31","val":71000000,"accn":"0001412232-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"end":"2013-12-31","val":71000000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2013Q4I"},{"end":"2014-09-30","val":46000000,"accn":"0001412232-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06","frame":"CY2014Q3I"},{"end":"2014-12-31","val":95300000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04"},{"end":"2014-12-31","val":95300000,"accn":"0001412232-15-000013","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14"},{"end":"2014-12-31","val":95300000,"accn":"0001412232-15-000021","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-12"},{"end":"2014-12-31","val":95300000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2014Q4I"},{"end":"2015-03-31","val":21100000,"accn":"0001412232-15-000013","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-14","frame":"CY2015Q1I"},{"end":"2015-06-30","val":128300000,"accn":"0001412232-15-000021","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-12","frame":"CY2015Q2I"},{"end":"2015-09-30","val":100500000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"}]}},"LongTermDebtCurrent":{"label":"Long-term Debt, Current Maturities","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2014-12-31","val":95300000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2014Q4I"},{"end":"2015-12-31","val":92800000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25"},{"end":"2015-12-31","val":92800000,"accn":"0001412232-16-000125","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05"},{"end":"2015-12-31","val":92800000,"accn":"0001412232-16-000153","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-31","val":92800000,"accn":"0001412232-16-000171","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03"},{"end":"2015-12-31","val":92800000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015Q4I"},{"end":"2016-03-31","val":173600000,"accn":"0001412232-16-000125","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":129100000,"accn":"0001412232-16-000153","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":120400000,"accn":"0001412232-16-000171","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03","frame":"CY2016Q3I"},{"end":"2016-12-31","val":250100000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24"},{"end":"2016-12-31","val":250100000,"accn":"0001412232-17-000056","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-05"},{"end":"2016-12-31","val":250100000,"accn":"0001412232-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31"},{"end":"2016-12-31","val":250100000,"accn":"0001412232-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2016Q4I"},{"end":"2017-03-31","val":386500000,"accn":"0001412232-17-000056","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-05","frame":"CY2017Q1I"},{"end":"2017-06-30","val":387500000,"accn":"0001412232-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-31","frame":"CY2017Q2I"},{"end":"2017-09-30","val":320200000,"accn":"0001412232-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2014-12-31","val":0,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2014Q4I"},{"end":"2015-09-30","val":1050300000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1021500000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":938600000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2014-12-31","val":22300000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2014Q4I"},{"end":"2015-09-30","val":57100000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":54800000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":54500000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2014-12-31","val":600000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2014Q4I"},{"end":"2015-09-30","val":665400000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":664700000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":4300000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2014-12-31","val":2800000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2014Q4I"},{"end":"2015-09-30","val":97200000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":97500000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":697100000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2014-12-31","val":1995200000,"accn":"0001412232-15-000006","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2014Q4I"},{"end":"2015-09-30","val":131700000,"accn":"0001412232-15-000041","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":115200000,"accn":"0001412232-16-000065","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015Q4I"},{"end":"2016-12-31","val":97900000,"accn":"0001412232-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. 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