Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 23	$ 28	$ 25	$ 35
Japan settlement [Member]
Operating Loss Carryforwards [Line Items]
Release of valuation allowance for specific deferred tax assets		13
Canada settlement [Member]
Operating Loss Carryforwards [Line Items]
Release of valuation allowance for specific deferred tax assets				14
American Taxpayer Relief Act of 2012 [Member]
Operating Loss Carryforwards [Line Items]
Release of valuation allowance for specific deferred tax assets			$ 16