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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
Jun. 30, 2016
USD ($)
Jun. 30, 2016
DKK
Jun. 30, 2016
EUR (€)
Jun. 30, 2016
GBP (£)
Jun. 30, 2016
NOK
Jun. 30, 2016
SGD
Jun. 30, 2016
RUB
Jun. 30, 2016
CAD
Dec. 31, 2015
USD ($)
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 $ 193 DKK 52 € 246 £ 1 NOK 7,277 SGD 10     $ 321 DKK 57 € 78 £ 4 NOK 9,655 SGD 14   CAD 2
Foreign currency, Non-designated hedging $ 399 DKK 80 € 227 £ 12 NOK 1,756 SGD 2 RUB 1,997 CAD 6 $ 515 DKK 153 € 371 £ 11 NOK 2,265 SGD 5 RUB 2,164 CAD 7