Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Computed tax benefit at statutory rate									$ 83	$ (25)	$ (131)
Effects of earnings in jurisdictions outside of U.S.									(13)	(12)	(25)
Change in valuation allowance									(197)	27	145
Permanent Items									44	44	48
Indefinite-lived assets									(2)	3	3
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount									3	9	(3)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount									(7)	(7)	(4)
Other, net									5	3	1
Income Tax (Expense) Benefit	$ (103)	$ 8	$ 12	$ 7	$ (1)	$ 14	$ 11	$ 14	$ (76)	$ 38	$ 48