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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member]
₽ in Millions, € in Millions, ¥ in Millions, £ in Millions, kr in Millions, kr in Millions, R in Millions, $ in Millions, $ in Millions
Jun. 30, 2018
USD ($)
Jun. 30, 2018
CAD ($)
Jun. 30, 2018
DKK (kr)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
GBP (£)
Jun. 30, 2018
JPY (¥)
Jun. 30, 2018
NOK (kr)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2018
RUB (₽)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
DKK (kr)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2017
NOK (kr)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2017
RUB (₽)
Derivative [Line Items]                                  
Foreign currency, Cash flow hedging $ 120 $ 1 kr 19 € 89 £ 15 ¥ 326 kr 4,040     $ 163 kr 30 € 120 £ 11 ¥ 982 kr 4,013    
Foreign currency, Non-designated hedging $ 512 $ 1 kr 12 € 119 £ 4   kr 1,998 R 176 ₽ 1,284 $ 463 kr 15 € 99 £ 3   kr 1,734 R 150 ₽ 2,699