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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member]
€ in Millions, £ in Millions, SGD in Millions, SEK in Millions, RUB in Millions, NOK in Millions, MXN in Millions, DKK in Millions, CAD in Millions, BRL in Millions, $ in Millions
Dec. 31, 2015
USD ($)
Dec. 31, 2015
SGD
Dec. 31, 2015
CAD
Dec. 31, 2015
DKK
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
NOK
Dec. 31, 2015
RUB
Dec. 31, 2014
USD ($)
Dec. 31, 2014
SEK
Dec. 31, 2014
SGD
Dec. 31, 2014
BRL
Dec. 31, 2014
CAD
Dec. 31, 2014
DKK
Dec. 31, 2014
EUR (€)
Dec. 31, 2014
GBP (£)
Dec. 31, 2014
MXN
Dec. 31, 2014
NOK
Derivative [Line Items]                                    
Foreign currency, Cash flow hedging $ 321 SGD 14 CAD 2 DKK 57 € 78 £ 4 NOK 9,655   $ 231   SGD 44   CAD 14 DKK 227 € 462 £ 80   NOK 10,781
Foreign currency, Non-designated hedging $ 515 SGD 5 CAD 7 DKK 153 € 371 £ 11 NOK 2,265 RUB 2,164 $ 1,092 SEK 3 SGD 4 BRL 57 CAD 4 DKK 322 € 401 £ 19 MXN 118 NOK 4,052