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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member])
In Millions, unless otherwise specified
Sep. 30, 2014
USD ($)
Sep. 30, 2014
CAD
Sep. 30, 2014
DKK
Sep. 30, 2014
EUR (€)
Sep. 30, 2014
GBP (£)
Sep. 30, 2014
MXN
Sep. 30, 2014
NOK
Sep. 30, 2014
RUB
Sep. 30, 2014
SEK
Sep. 30, 2014
SGD
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CAD
Dec. 31, 2013
DKK
Dec. 31, 2013
EUR (€)
Dec. 31, 2013
GBP (£)
Dec. 31, 2013
NOK
Dec. 31, 2013
RUB
Dec. 31, 2013
SEK
Dec. 31, 2013
SGD
Derivative [Line Items]                                      
Foreign currency, Cash flow hedging $ 350 14 283 € 560 £ 32 129 11,430     51 $ 357 16 278 € 406 £ 23 10,503     17
Foreign currency, Non-designated hedging $ 1,057 4 438 € 413 £ 31 134 2,747 1,575 9 3 $ 715 3 177 € 310 £ 14 3,257 2,149 4 3