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Cash Equivalents, and Short-term Investments","description":"Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.","units":{"USD":[{"end":"2017-03-31","val":2200000000,"accn":"0000803649-17-000014","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1I"},{"end":"2017-06-30","val":2200000000,"accn":"0000803649-17-000019","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-25","frame":"CY2017Q2I"},{"end":"2017-09-30","val":2500000000,"accn":"0000803649-17-000026","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-25","frame":"CY2017Q3I"},{"end":"2017-12-31","val":2600000000,"accn":"0000803649-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-15","frame":"CY2017Q4I"},{"end":"2018-03-31","val":3100000000,"accn":"0000803649-18-000016","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08"},{"end":"2018-03-31","val":3100000000,"accn":"0001104659-18-031448","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2018Q1I"},{"end":"2018-06-30","val":2800000000,"accn":"0000803649-18-000048","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-31","frame":"CY2018Q2I"},{"end":"2018-09-30","val":2900000000,"accn":"0000803649-18-000064","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-25","frame":"CY2018Q3I"},{"end":"2018-12-31","val":2700000000,"accn":"0000803649-19-000033","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-14","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":{"label":"Cash, 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. 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Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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costs.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":827000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2008"},{"start":"2009-01-01","end":"2009-06-30","val":6826000,"accn":"0001104659-10-041888","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2009-01-01","end":"2009-09-30","val":7026000,"accn":"0001104659-10-055638","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2009-01-01","end":"2009-12-31","val":17721000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2009-01-01","end":"2009-12-31","val":17721000,"accn":"0001047469-12-001632","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":187000,"accn":"0001104659-11-026832","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":199000,"accn":"0001104659-10-041888","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2010-01-01","end":"2010-06-30","val":199000,"accn":"0001104659-11-044697","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2010-01-01","end":"2010-09-30","val":9565000,"accn":"0001104659-10-055638","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2010-01-01","end":"2010-09-30","val":9565000,"accn":"0001104659-11-061618","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2010-01-01","end":"2010-12-31","val":13055000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"},{"start":"2010-01-01","end":"2010-12-31","val":13055000,"accn":"0001047469-12-001632","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"start":"2010-01-01","end":"2010-12-31","val":13055000,"accn":"0001047469-13-001551","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25","frame":"CY2010"},{"start":"2011-01-01","end":"2011-06-30","val":273000,"accn":"0001104659-11-044697","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-01-01","end":"2011-06-30","val":273000,"accn":"0001104659-12-056357","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2011-01-01","end":"2011-09-30","val":853000,"accn":"0001104659-11-061618","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2011-01-01","end":"2011-09-30","val":853000,"accn":"0001104659-12-076515","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":7131000,"accn":"0001047469-12-001632","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"start":"2011-01-01","end":"2011-12-31","val":7131000,"accn":"0001047469-13-001551","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25"},{"start":"2011-01-01","end":"2011-12-31","val":7131000,"accn":"0001047469-14-001585","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":5767000,"accn":"0001104659-12-034511","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"start":"2012-01-01","end":"2012-03-31","val":5767000,"accn":"0001104659-13-039277","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":6049000,"accn":"0001104659-12-056357","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2012-01-01","end":"2012-06-30","val":6049000,"accn":"0001104659-13-060990","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2012-01-01","end":"2012-09-30","val":14734000,"accn":"0001104659-12-076515","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-09-30","val":14734000,"accn":"0001104659-13-081936","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-12-31","val":15117000,"accn":"0001047469-13-001551","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-25"},{"start":"2012-01-01","end":"2012-12-31","val":15117000,"accn":"0001047469-14-001585","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":15117000,"accn":"0001628280-15-000849","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":1193000,"accn":"0001104659-13-039277","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09"},{"start":"2013-01-01","end":"2013-03-31","val":1193000,"accn":"0001104659-14-036450","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1200000,"accn":"0001104659-13-060990","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2013-01-01","end":"2013-06-30","val":1200000,"accn":"0001104659-14-058317","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"start":"2013-01-01","end":"2013-09-30","val":1204000,"accn":"0001104659-13-081936","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-09-3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AndDevelopRealEstate":{"label":"Payments to Acquire and Develop Real Estate","description":"The cash outflow from the acquisition of a piece of land and anything permanently fixed to it, including buildings, structures on it and so forth, and payments to develop real estate assets by adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements. Including real estate intended to generate income for the owner; excluding real estate acquired for use by the owner.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":416461000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2008"},{"start":"2009-01-01","end":"2009-06-30","val":266319000,"accn":"0001104659-10-041888","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2009-01-01","end":"2009-09-30","val":470564000,"accn":"0001104659-10-055638","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2009-01-01","end":"2009-12-31","val":665410000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2009"},{"start":"2010-01-01","end":"2010-03-31","val":14565000,"accn":"0001104659-11-026832","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2010Q1"},{"start":"2010-01-01","end":"2010-06-30","val":205443000,"accn":"0001104659-11-044697","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2010-01-01","end":"2010-06-30","val":205443000,"accn":"0001104659-10-041888","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2010-01-01","end":"2010-09-30","val":406983000,"accn":"0001104659-11-061618","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2010-01-01","end":"2010-09-30","val":406983000,"accn":"0001104659-10-055638","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2010-01-01","end":"2010-12-31","val":972913000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25","frame":"CY2010"},{"start":"2011-01-01","end":"2011-03-31","val":314207000,"accn":"0001104659-11-026832","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-06","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":548266000,"accn":"0001104659-11-044697","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-01-01","end":"2011-09-30","val":829520000,"accn":"0001104659-11-061618","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"}]}},"PaymentsToAcquireAvailableForSaleSecuritiesEquity":{"label":"Payments to Acquire Available-for-sale Securities, Equity","description":"The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.","units":{"USD":[{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000803649-16-000024","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":23988000,"accn":"0000803649-16-000024","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18"},{"start":"2014-01-01","end":"2014-12-31","val":23988000,"accn":"0000803649-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000803649-16-000024","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000803649-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0000803649-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-15","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000803649-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000803649-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-15","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":276238000,"accn":"0000803649-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-15","frame":"CY2017"}]}},"PaymentsToAcquireHeldToMaturitySecurities":{"label":"Payments to Acquire Held-to-maturity Securities","description":"Amount of cash outflow through purchase of long-term held-to-maturity securities.","units":{"USD":[{"start":"2009-01-01","end":"2009-06-30","val":6760000,"accn":"0001104659-10-041888","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-04"},{"start":"2009-01-01","end":"2009-09-30","val":6760000,"accn":"0001104659-10-055638","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-03"},{"start":"2009-01-01","end":"2009-12-31","val":6760000,"accn":"0001047469-12-001632","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27","frame":"CY2009"},{"start":"2009-01-01","end":"2009-12-31","val":6760000,"accn":"0001047469-11-001393","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-25"}]}},"PaymentsToAcquireInterestInSubsidiariesAndAffiliates":{"label":"Payments to Acquire Interest in Subsidiaries and Affiliates","description":"The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled 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