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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
Dec. 31, 2018
USD ($)
Dec. 31, 2018
NOK (kr)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
DKK (kr)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
NOK (kr)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
DKK (kr)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
ZAR (R)
Dec. 31, 2017
RUB (₽)
Derivative [Line Items]                                
Foreign currency, Cash flow hedging $ 96 kr 4,118 ¥ 121 € 71 kr 14 £ 9     $ 163 kr 4,013 ¥ 982 € 120 kr 30 £ 11    
Foreign currency, Non-designated hedging $ 535 kr 1,111   € 101 kr 21 £ 3 $ 204 R 124 $ 463 kr 1,734   € 99 kr 15 £ 3 R 150 ₽ 2,699