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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member])
In Millions, unless otherwise specified
Dec. 31, 2012
USD ($)
Dec. 31, 2012
BRL
Dec. 31, 2012
CAD
Dec. 31, 2012
DKK
Dec. 31, 2012
EUR (€)
Dec. 31, 2012
GBP (£)
Dec. 31, 2012
NOK
Dec. 31, 2012
RUB
Dec. 31, 2012
SEK
Dec. 31, 2012
SGD
Dec. 31, 2011
USD ($)
Dec. 31, 2011
DKK
Dec. 31, 2011
EUR (€)
Dec. 31, 2011
GBP (£)
Dec. 31, 2011
NOK
Dec. 31, 2011
RUB
Dec. 31, 2011
SEK
Dec. 31, 2011
SGD
Derivative [Line Items]                                    
Foreign currency, Cash flow hedging $ 331     134 € 389 £ 6 6,281     14 $ 402 98 € 456 £ 2 6,639     10
Foreign currency, Non-designated hedging $ 967 135 2 177 € 225 £ 9 1,684 1,467 5 24 $ 483 67 € 161 £ 9 2,310 786 4 5