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Income Taxes - Income Tax Expense (Benefit) by Current and Deferred (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
Current:
United States federal									$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (9)us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State									1	1	2
Foreign									40us-gaap_CurrentForeignTaxExpenseBenefit	37us-gaap_CurrentForeignTaxExpenseBenefit	36us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax provision (benefit)									41us-gaap_CurrentIncomeTaxExpenseBenefit	29us-gaap_CurrentIncomeTaxExpenseBenefit	38us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred, net of changes in valuation allowances:
United States federal									(6)	3	3
State									(15)	0	0
Foreign									(96)	6	7
Income Tax Benefit (Expense)	$ 103us-gaap_IncomeTaxExpenseBenefit	$ (8)us-gaap_IncomeTaxExpenseBenefit	$ (12)us-gaap_IncomeTaxExpenseBenefit	$ (7)us-gaap_IncomeTaxExpenseBenefit	$ 1us-gaap_IncomeTaxExpenseBenefit	$ (14)us-gaap_IncomeTaxExpenseBenefit	$ (11)us-gaap_IncomeTaxExpenseBenefit	$ (14)us-gaap_IncomeTaxExpenseBenefit	$ 76us-gaap_IncomeTaxExpenseBenefit	$ (38)us-gaap_IncomeTaxExpenseBenefit	$ (48)us-gaap_IncomeTaxExpenseBenefit