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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member]
€ in Millions, ¥ in Millions, £ in Millions, ZAR in Millions, SGD in Millions, RUB in Millions, NOK in Millions, DKK in Millions, CAD in Millions, $ in Millions
Dec. 31, 2016
USD ($)
Dec. 31, 2016
SGD
Dec. 31, 2016
CAD
Dec. 31, 2016
DKK
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
NOK
Dec. 31, 2016
RUB
Dec. 31, 2016
JPY (¥)
Dec. 31, 2016
ZAR
Dec. 31, 2015
USD ($)
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
Derivative [Line Items]                                    
Foreign currency, Cash flow hedging $ 321 SGD 2   DKK 29 € 279 £ 1 NOK 5,621   ¥ 1,462   $ 321 SGD 14 CAD 2 DKK 57 € 78 £ 4 NOK 9,655  
Foreign currency, Non-designated hedging $ 457 SGD 7 CAD 1 DKK 49 € 272 £ 3 NOK 538 RUB 1,893   ZAR 150 $ 515 SGD 5 CAD 7 DKK 153 € 371 £ 11 NOK 2,265 RUB 2,164