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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) (Forward Contracts [Member]) In Millions, unless otherwise specified	Sep. 30, 2013 USD ($)	Sep. 30, 2013 BRL	Sep. 30, 2013 CAD	Sep. 30, 2013 DKK	Sep. 30, 2013 EUR (€)	Sep. 30, 2013 GBP (£)	Sep. 30, 2013 NOK	Sep. 30, 2013 RUB	Sep. 30, 2013 SEK	Sep. 30, 2013 SGD	Dec. 31, 2012 USD ($)	Dec. 31, 2012 BRL	Dec. 31, 2012 CAD	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	$ 426			222	€ 376	£ 26	9,631			15	$ 331			134	€ 389	£ 6	6,281			14
Foreign currency, Non-designated hedging	$ 532	56	2	261	€ 214	£ 23	2,121	1,779	2	16	$ 967	135	2	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

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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

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