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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 | Jun. 30, 2015 USD ($) | Jun. 30, 2015 RUB | Jun. 30, 2015 SEK | Jun. 30, 2015 SGD | Jun. 30, 2015 CAD | Jun. 30, 2015 DKK | Jun. 30, 2015 EUR (€) | Jun. 30, 2015 GBP (£) | Jun. 30, 2015 NOK | Dec. 31, 2014 USD ($) | Dec. 31, 2014 SEK | Dec. 31, 2014 SGD | Dec. 31, 2014 CAD | Dec. 31, 2014 DKK | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 GBP (£) | Dec. 31, 2014 NOK | Dec. 31, 2014 BRL | Dec. 31, 2014 MXN
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 177 |  |  | SGD 24 | CAD 8 | DKK 105 | € 242 | £ 37 | NOK 11,732 | $ 231 |  | SGD 44 | CAD 14 | DKK 227 | € 462 | £ 80 | NOK 10,781 |  |
Foreign currency, Non-designated hedging | $ 1,440 | RUB 1,695 | SEK 1 | SGD 2 | CAD 7 | DKK 218 | € 434 | £ 13 | NOK 3,015 | $ 1,092 | SEK 3 | SGD 4 | CAD 4 | DKK 322 | € 401 | £ 19 | NOK 4,052 | BRL 57 | MXN 118

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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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