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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member] € in Millions, £ in Millions, SGD in Millions, SEK in Millions, RUB in Millions, NOK in Millions, MXN in Millions, DKK in Millions, CAD in Millions, BRL in Millions, $ in Millions | Dec. 31, 2015 USD ($) | Dec. 31, 2015 SGD | Dec. 31, 2015 CAD | Dec. 31, 2015 DKK | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 NOK | Dec. 31, 2015 RUB | Dec. 31, 2014 USD ($) | Dec. 31, 2014 SEK | Dec. 31, 2014 SGD | Dec. 31, 2014 BRL | Dec. 31, 2014 CAD | Dec. 31, 2014 DKK | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 GBP (£) | Dec. 31, 2014 MXN | Dec. 31, 2014 NOK
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 321 | SGD 14 | CAD 2 | DKK 57 | € 78 | £ 4 | NOK 9,655 |  | $ 231 |  | SGD 44 |  | CAD 14 | DKK 227 | € 462 | £ 80 |  | NOK 10,781
Foreign currency, Non-designated hedging | $ 515 | SGD 5 | CAD 7 | DKK 153 | € 371 | £ 11 | NOK 2,265 | RUB 2,164 | $ 1,092 | SEK 3 | SGD 4 | BRL 57 | CAD 4 | DKK 322 | € 401 | £ 19 | MXN 118 | NOK 4,052

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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=56946850&loc=SL5624163-113959 + Details
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