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Description of Business and Significant Accounting Policies - Out of Period Adjustments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Misapplication of Accounting Guidance Related to Recognition of Income Tax Expense [Member]
Sep. 30, 2012
Misapplication of Accounting Guidance Related to Recognition of Income Tax Expense [Member]
Dec. 31, 2011
Inter-company Transactions Included in Cumulative Translation Adjustment [Member]
Dec. 31, 2011
Brazil Tax Accounts Determined to be Unrecoverable [Member]
Income tax benefit $ (98) $ (223) $ 66 $ 15 $ (5)    
Charges in other income and expense related to foreign currency fluctuations           2  
Increase in selling, general and administrative expenses to correct tax accounts in Brazil determined to be unrecoverable             $ 4