Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Abstract]
Valuation Allowances and Reserves, Balance	$ 6	[1]	$ 5	[1]	$ 3	[1]	$ 3	[1]
Valuation Allowances and Reserves, Charged to Cost and Expense	2	[1]	2	[1]	3	[1]
Valuation Allowances and Reserves, Adjustments	0	[1]	0	[1]	0	[1]
Valuation Allowances and Reserves, Deductions	$ 1	[1]	$ 0	[1]	$ 3	[1]

[1] (1)Reserves for doubtful accounts are primarily current assets.