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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2015-12-31","val":451000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2015Q4I"},{"end":"2016-12-31","val":427000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2016Q4I"},{"end":"2017-12-31","val":394000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2017Q4I"},{"end":"2018-12-31","val":328000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":-24000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-33000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":-66000000,"accn":"0000757011-19-000016","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2018"}]}},"CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths":{"label":"Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months","description":"The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":1000000,"accn":"0000950123-11-072313","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03"},{"start":"2011-01-01","end":"2011-09-30","val":1000000,"accn":"0000950123-11-093430","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-31"},{"start":"2011-01-01","end":"2011-12-31","val":1000000,"accn":"0001193125-12-059658","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-14","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":1000000,"accn":"0001193125-12-192122","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-30","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":1000000,"accn":"0001193125-12-314476","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-25"}]}},"CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Investing Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of investing activities of discontinued operations. 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Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived 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