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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
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

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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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