Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Allowance for doubtful accounts and estimated returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	$ 53	$ 52		$ 47
Valuation Allowances and Reserves, Charged to Cost and Expense	6	1		9
Valuation Allowances and Reserves, Charged to Other Accounts	0	0		0
Valuation Allowances and Reserves, Deductions	10	0		4
Valuation Allowances and Reserves, Ending Balance	49	53		52
Valuation allowance for deferred tax assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	1	2		5
Valuation Allowances and Reserves, Charged to Cost and Expense	0	0		0
Valuation Allowances and Reserves, Charged to Other Accounts	0	0		0
Valuation Allowances and Reserves, Deductions	0	1	[1]	3	[1]
Valuation Allowances and Reserves, Ending Balance	$ 1	$ 1		$ 2

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