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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member]) In Millions, unless otherwise specified | Mar. 31, 2013 USD ($) | Mar. 31, 2013 BRL | Mar. 31, 2013 DKK | Mar. 31, 2013 EUR (€) | Mar. 31, 2013 GBP (£) | Mar. 31, 2013 MXN | Mar. 31, 2013 NOK | Mar. 31, 2013 RUB | Mar. 31, 2013 SEK | Mar. 31, 2013 SGD | Dec. 31, 2012 USD ($) | 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 | $ 290 |  | 201 | € 471 | £ 44 |  | 7,913 |  |  | 12 | $ 331 |  | 134 | € 389 | £ 6 | 6,281 |  |  | 14
Foreign currency, Non-designated hedging | $ 1,032 | 104 | 275 | € 241 | £ 16 | 224 | 2,873 | 1,224 | 10 | 37 | $ 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=7491637&loc=d3e13495-108611 + Details
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