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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
Sep. 30, 2019
USD ($)
Sep. 30, 2019
KRW (₩)
Sep. 30, 2019
NOK (kr)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
ZAR (R)
Sep. 30, 2019
MXN ($)
Sep. 30, 2019
JPY (¥)
Sep. 30, 2019
SGD ($)
Sep. 30, 2019
GBP (£)
Sep. 30, 2019
DKK (kr)
Sep. 30, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
NOK (kr)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
ZAR (R)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
DKK (kr)
Forward Contracts [Member]                                      
Derivative [Line Items]                                      
Foreign currency, Cash flow hedging $ 635 ₩ 17,600 kr 3,845 € 167 R 124 $ 119 ¥ 113 $ 38 £ 26 kr 16 $ 2 $ 631 kr 5,229 € 172 R 124 $ 204 ¥ 121 £ 12 kr 35