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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Excluding Interest and Penalties) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation Of Unrecognized Tax Benefits [Line Items]      
Balance at beginning of year $ 51 $ 46 $ 48
Additions for tax positions of the current year         
Additions for tax positions of prior years 39 13 30
Reductions for tax positions of prior years (7) (3) (5)
Settlements with tax authorities (18) (4) (22)
Expiration of the statute of limitations     (5)
Foreign currency translation 1 (1)  
Balance at end of year $ 66 $ 51 $ 46