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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member])
In Millions, unless otherwise specified
Jun. 30, 2014
USD ($)
Jun. 30, 2014
BRL
Jun. 30, 2014
CAD
Jun. 30, 2014
DKK
Jun. 30, 2014
EUR (€)
Jun. 30, 2014
GBP (£)
Jun. 30, 2014
MXN
Jun. 30, 2014
NOK
Jun. 30, 2014
RUB
Jun. 30, 2014
SEK
Jun. 30, 2014
SGD
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CAD
Dec. 31, 2013
DKK
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
GBP (£)
Dec. 31, 2013
MXN
Dec. 31, 2013
NOK
Dec. 31, 2013
RUB
Dec. 31, 2013
SEK
Dec. 31, 2013
SGD
Derivative [Line Items]                                          
Foreign currency, Cash flow hedging $ 305   15 273 € 474 £ 43 258 11,836     32 $ 357 16 278 € 406 £ 23    10,503     17
Foreign currency, Non-designated hedging $ 913 44 3 290 € 426 £ 18   2,857 1,691 9 20 $ 715 3 177 € 310 £ 14   3,257 2,149 4 3