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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Total, Beginning balance $ (23) $ 91 $ 90
Total, Current period activity 155 (155) 3
Total, Tax effect (25) 41 (2)
Total, Ending balance 107 (23) 91
Derivative Financial Instruments, Beginning balance (57) 6 19
Derivative Financial Instruments, Current period activity 138 (88) (17)
Derivative Financial Instruments, Tax effect (39) 25 4
Derivative Financial Instruments, Ending balance 42 (57) 6
Currency Translation Adjustments, Beginning balance 68 133 120
Currency Translation Adjustments, Current period activity 64 (86) 19
Currency Translation Adjustments, Tax effect   21 (6)
Currency Translation Adjustments, Ending balance 132 68 133
Defined Benefit Plans, Beginning balance (34) (48) (49)
Defined Benefit Plans, Current period activity (47) 19 1
Defined Benefit Plans, Tax effect 14 (5)  
Defined Benefit Plans, Ending balance $ (67) $ (34) $ (48)