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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail)
€ in Millions, ₩ in Millions, ¥ in Millions, £ in Millions, kr in Millions, kr in Millions, R in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
KRW (₩)
Mar. 31, 2019
NOK (kr)
Mar. 31, 2019
MXN ($)
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
ZAR (R)
Mar. 31, 2019
JPY (¥)
Mar. 31, 2019
DKK (kr)
Mar. 31, 2019
SGD ($)
Mar. 31, 2019
GBP (£)
Mar. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
NOK (kr)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
DKK (kr)
Dec. 31, 2018
GBP (£)
Forward Contracts [Member]                                      
Derivative [Line Items]                                      
Foreign currency, Cash flow hedging $ 699 ₩ 17,600 kr 4,725 $ 193 € 192 R 124 ¥ 121 kr 103 $ 38 £ 22 $ 2 $ 631 kr 5,229 $ 204 € 172 R 124 ¥ 121 kr 35 £ 12