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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member])
In Millions, unless otherwise specified
Jun. 30, 2013
USD ($)
Jun. 30, 2013
BRL
Jun. 30, 2013
DKK
Jun. 30, 2013
EUR (€)
Jun. 30, 2013
GBP (£)
Jun. 30, 2013
NOK
Jun. 30, 2013
RUB
Jun. 30, 2013
SEK
Jun. 30, 2013
SGD
Dec. 31, 2012
USD ($)
Dec. 31, 2012
BRL
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
Derivative [Line Items]                                    
Foreign currency, Cash flow hedging $ 509   195 € 376 £ 34 9,440     16 $ 389   134 € 331 £ 6 6,281     14
Foreign currency, Non-designated hedging $ 941 172 183 € 191 £ 11 2,979 1,841 1 16 $ 967 135 177 € 225 £ 9 1,684 1,467 5 24