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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member] € in Millions, ¥ in Millions, £ in Millions, ZAR in Millions, SGD in Millions, RUB in Millions, NOK in Millions, DKK in Millions, CAD in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2017 NOK | Dec. 31, 2017 DKK | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 RUB | Dec. 31, 2017 ZAR | Dec. 31, 2016 USD ($) | Dec. 31, 2016 JPY (¥) | Dec. 31, 2016 NOK | Dec. 31, 2016 SGD | Dec. 31, 2016 DKK | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 RUB | Dec. 31, 2016 ZAR | Dec. 31, 2016 CAD
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 163 | ¥ 982 | NOK 4,013 | DKK 30 | € 120 | £ 11 |  |  | $ 321 | ¥ 1,462 | NOK 5,621 | SGD 2 | DKK 29 | € 279 | £ 1 |  |  |
Foreign currency, Non-designated hedging | $ 463 |  | NOK 1,734 | DKK 15 | € 99 | £ 3 | RUB 2,699 | ZAR 150 | $ 457 |  | NOK 538 | SGD 7 | DKK 49 | € 272 | £ 3 | RUB 1,893 | ZAR 150 | CAD 1

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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://www.xbrl.org/2003/role/presentationRef -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=84234895&loc=SL5624163-113959 + Details
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- Definition Net fair value of all derivative instruments not designated as a hedging instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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