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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member] € in Millions, £ in Millions, SGD in Millions, RUB in Millions, NOK in Millions, DKK in Millions, CAD in Millions, $ in Millions | Sep. 30, 2016 USD ($) | Sep. 30, 2016 DKK | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 GBP (£) | Sep. 30, 2016 NOK | Sep. 30, 2016 SGD | Sep. 30, 2016 RUB | Sep. 30, 2016 CAD | Dec. 31, 2015 USD ($) | Dec. 31, 2015 DKK | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 NOK | Dec. 31, 2015 SGD | Dec. 31, 2015 RUB | Dec. 31, 2015 CAD
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 155 | DKK 37 | € 186 | £ 1 | NOK 6,433 | SGD 8 |  |  | $ 321 | DKK 57 | € 78 | £ 4 | NOK 9,655 | SGD 14 |  | CAD 2
Foreign currency, Non-designated hedging | $ 536 | DKK 108 | € 273 | £ 15 | NOK 1,311 | SGD 1 | RUB 1,956 | CAD 11 | $ 515 | DKK 153 | € 371 | £ 11 | NOK 2,265 | SGD 5 | RUB 2,164 | CAD 7

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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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- 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=73719730&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=73719730&loc=d3e13495-108611 + Details
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