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Income Taxes - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Taxes [Line Items]        
Income Tax Expense (Benefit) $ 34 $ 33 $ 96 $ 97
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00% 35.00% 35.00% 35.00%
Income Tax Reconciliation, Repatriation of Foreign Earnings 1 2 5 6
Deferred Tax Assets, Valuation Allowance $ 750   $ 750