Income Taxes - Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ 0	$ 4	$ 11
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			1
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, Beginning balance	18	15	6
Gross increases - prior period tax positions	(2)
Gross increases - tax positions during 2012	1	1
Gross decreases - lapse of statue of limitations	(6)	(1)
Gross decreases - settlements with taxing authorities	0	(1)	(1)
Unrecognized tax benefits, Ending Balance	13	18	15
Accrued interest and penalties in the Company's liability for uncertain tax positions	(18)	(22)	(20)	4
Unrecognized Tax Benefits, Interest on Income Taxes Expense	(4)
Accrued interest and penalties related to uncertain tax positions in income tax expense in its consolidated statements of operation		$ 3	$ 0