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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member]) In Millions, unless otherwise specified | Jun. 30, 2013 USD ($) | Jun. 30, 2013 BRL | Jun. 30, 2013 DKK | Jun. 30, 2013 EUR (€) | Jun. 30, 2013 GBP (£) | Jun. 30, 2013 NOK | Jun. 30, 2013 RUB | Jun. 30, 2013 SEK | Jun. 30, 2013 SGD | Dec. 31, 2012 USD ($) | Dec. 31, 2012 BRL | Dec. 31, 2012 DKK | Dec. 31, 2012 EUR (€) | Dec. 31, 2012 GBP (£) | Dec. 31, 2012 NOK | Dec. 31, 2012 RUB | Dec. 31, 2012 SEK | Dec. 31, 2012 SGD
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency, Cash flow hedging | $ 509 |  | 195 | € 376 | £ 34 | 9,440 |  |  | 16 | $ 389 |  | 134 | € 331 | £ 6 | 6,281 |  |  | 14
Foreign currency, Non-designated hedging | $ 941 | 172 | 183 | € 191 | £ 11 | 2,979 | 1,841 | 1 | 16 | $ 967 | 135 | 177 | € 225 | £ 9 | 1,684 | 1,467 | 5 | 24

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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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