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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, 2016 USD ($) | Dec. 31, 2016 SGD | Dec. 31, 2016 CAD | Dec. 31, 2016 DKK | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 NOK | Dec. 31, 2016 RUB | Dec. 31, 2016 JPY (¥) | Dec. 31, 2016 ZAR | Dec. 31, 2015 USD ($) | Dec. 31, 2015 SGD | Dec. 31, 2015 CAD | Dec. 31, 2015 DKK | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 NOK | Dec. 31, 2015 RUB
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 321 | SGD 2 |  | DKK 29 | € 279 | £ 1 | NOK 5,621 |  | ¥ 1,462 |  | $ 321 | SGD 14 | CAD 2 | DKK 57 | € 78 | £ 4 | NOK 9,655 |
Foreign currency, Non-designated hedging | $ 457 | SGD 7 | CAD 1 | DKK 49 | € 272 | £ 3 | NOK 538 | RUB 1,893 |  | ZAR 150 | $ 515 | SGD 5 | CAD 7 | DKK 153 | € 371 | £ 11 | NOK 2,265 | RUB 2,164

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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=64837297&loc=SL5624163-113959 + Details
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