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Change in Unrecognized Tax Benefit (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]      
Unrecognized tax benefits beginning balance $ 1,164 $ 1,522 $ 1,256
Increases from positions taken during prior periods 94 119 220
Decreases from positions taken during prior periods (132) (198) (147)
Increases from positions taken during the current period 131 264 266
Decreases relating to settlements with taxing authorities (7) (257) (17)
Reductions resulting from the lapse of the applicable statute of limitations (55) (23) (16)
Impact of Spin-Off   (261)  
Currency / other (6) (2) (40)
Unrecognized tax benefits ending balance $ 1,189 $ 1,164 $ 1,522