Income Taxes - Income Tax Expense (Benefit) by Current and Deferred (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
United States federal	$ (9)	$ 0	$ 0
State	1	2	0
Foreign	37	36	8
Current income tax provision (benefit)	29	38	8
Deferred, net of changes in valuation allowances:
United States federal	3	3	30
State	0	0	1
Deferred foreign income tax expense (benefit)	6	7	2
Income tax provision (benefit)	$ 38	$ 48	$ 41