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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
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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