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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, $ in Millions | Sep. 30, 2018 USD ($) | Sep. 30, 2018 NOK (kr) | Sep. 30, 2018 JPY (¥) | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 DKK (kr) | Sep. 30, 2018 GBP (£) | Sep. 30, 2018 CAD ($) | Sep. 30, 2018 RUB (₽) | Sep. 30, 2018 MXN ($) | Sep. 30, 2018 ZAR (R) | Dec. 31, 2017 USD ($) | 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 RUB (₽) | Dec. 31, 2017 ZAR (R)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 111 | kr 3,875 | ¥ 326 | € 82 | kr 19 | £ 9 | $ 1 |  |  |  | $ 163 | kr 4,013 | ¥ 982 | € 120 | kr 30 | £ 11 |  |
Foreign currency, Non-designated hedging | $ 539 | kr 1,708 |  | € 122 | kr 15 | £ 8 | $ 1 | ₽ 1,329 | $ 285 | R 176 | $ 463 | kr 1,734 |  | € 99 | kr 15 | £ 3 | ₽ 2,699 | R 150

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- Definition Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(b),(c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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