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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member])
In Millions, unless otherwise specified
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CAD
Dec. 31, 2013
DKK
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
GBP (£)
Dec. 31, 2013
NOK
Dec. 31, 2013
RUB
Dec. 31, 2013
SEK
Dec. 31, 2013
SGD
Dec. 31, 2012
USD ($)
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
Derivative [Line Items]                                      
Foreign currency, Cash flow hedging $ 357 16 278 € 406 £ 23 10,503     17 $ 357     134 € 389 £ 6 6,281     14
Foreign currency, Non-designated hedging $ 715 3 177 € 310 £ 14 3,257 2,149 4 3 $ 967 135 2 177 € 225 £ 9 1,684 1,467 5 24