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Consolidated Statements of Income (Parenthetical) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Consolidated Statements of Income    
Tax Expense included in Income (Loss) from Discontinued Operations  $ 1$ 5