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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member]
€ in Millions, £ in Millions, SGD in Millions, RUB in Millions, NOK in Millions, DKK in Millions, CAD in Millions, $ in Millions
Sep. 30, 2016
USD ($)
Sep. 30, 2016
DKK
Sep. 30, 2016
EUR (€)
Sep. 30, 2016
GBP (£)
Sep. 30, 2016
NOK
Sep. 30, 2016
SGD
Sep. 30, 2016
RUB
Sep. 30, 2016
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2015
DKK
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
GBP (£)
Dec. 31, 2015
NOK
Dec. 31, 2015
SGD
Dec. 31, 2015
RUB
Dec. 31, 2015
CAD
Derivative [Line Items]                                
Foreign currency, Cash flow hedging $ 155 DKK 37 € 186 £ 1 NOK 6,433 SGD 8     $ 321 DKK 57 € 78 £ 4 NOK 9,655 SGD 14   CAD 2
Foreign currency, Non-designated hedging $ 536 DKK 108 € 273 £ 15 NOK 1,311 SGD 1 RUB 1,956 CAD 11 $ 515 DKK 153 € 371 £ 11 NOK 2,265 SGD 5 RUB 2,164 CAD 7