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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
A reconciliation of the provision (benefit) for income taxes      
Statutory U.S. Federal tax rate (as a percent) 35.00%    
Increase (decrease) in provision for income taxes due to:      
Tax provision on pretax earnings (loss) from continuing operations at statutory U.S. Federal tax rate $ 115 $ (139) $ 149
Differences in income taxes on foreign earnings, losses and remittances   (13) (46)
Goodwill Impairment   224  
Intraperiod tax allocation - U.S.     (8)
Changes in valuation allowance (7) 15 11
Tax audits and settlements (1) 3 21
Other items 1 (5) 2
Provision for income taxes 108 85 129
Reduction of valuation allowance and benefit allocated to income tax expense from continuing operations     $ (8)