Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2012 Allowance for doubtful accounts and estimated returns [Member]	Dec. 31, 2010 Allowance for doubtful accounts and estimated returns [Member]	Dec. 31, 2012 Valuation allowance for deferred tax assets [Member]	Dec. 31, 2011 Valuation allowance for deferred tax assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	$ 49	$ 53	$ 1	$ 1
Valuation Allowances and Reserves, Charged to Cost and Expense	18		0	0
Valuation Allowances and Reserves, Charged to Other Accounts	0		0	0
Valuation Allowances and Reserves, Deductions	6		0	0	[1]
Valuation Allowances and Reserves, Ending Balance	$ 61	$ 53	$ 1	$ 1

[1] (1) Decrease in allowance due to utilization of tax loss and tax credit carryforwards.