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Income Tax - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Beginning balance $ 148 $ 149
Additions based on tax positions related to the current year 44 36
Additions for tax positions of prior years 39 19
Reductions for tax positions of prior years   (3)
Settlements (1)   
Reductions for lapse of statute of limitations   (50)
Prepayment (6)  
Foreign currency translation 3 (3)
Ending balance $ 227 $ 148