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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member]) In Millions, unless otherwise specified | Mar. 31, 2014 USD ($) | Mar. 31, 2014 CAD | Mar. 31, 2014 DKK | Mar. 31, 2014 EUR (€) | Mar. 31, 2014 GBP (£) | Mar. 31, 2014 NOK | Mar. 31, 2014 RUB | Mar. 31, 2014 SEK | Mar. 31, 2014 SGD | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CAD | Dec. 31, 2013 DKK | Dec. 31, 2013 EUR (€) | Dec. 31, 2013 GBP (£) | Dec. 31, 2013 NOK | Dec. 31, 2013 RUB | Dec. 31, 2013 SEK | Dec. 31, 2013 SGD
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 443 | 16 | 266 | € 500 | £ 52 | 10,172 |  |  | 36 | $ 357 | 16 | 278 | € 406 | £ 23 | 10,503 |  |  | 17
Foreign currency, Non-designated hedging | $ 801 | 5 | 383 | € 381 | £ 26 | 3,866 | 1,786 | 11 | 15 | $ 715 | 3 | 177 | € 310 | £ 14 | 3,257 | 2,149 | 4 | 3

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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=7476318&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=28364263&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=28364263&loc=d3e13495-108611 + Details
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