Organization and Basis of Consolidation and Presentation - Consolidation and Debt Issuance Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Recent Accounting Pronouncements
Deferred tax asset	$ 1,886		$ 1,886		$ 1,835
Depreciation and amortization	33	$ 108	352	$ 320
Interest expense, net	116	112	349	329
ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs | Reclassification due to retrospective application of revised guidance
Recent Accounting Pronouncements
Depreciation and amortization		(2)		(7)
Interest expense, net		$ 2		$ 7
Consolidated Entity Excluding Variable Interest Entities (VIE)
Recent Accounting Pronouncements
Deferred tax asset	$ 1,886		$ 1,886		$ 1,835