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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member] € in Millions, £ in Millions, SGD in Millions, RUB in Millions, NOK in Millions, DKK in Millions, CAD in Millions, $ in Millions	Mar. 31, 2016 USD ($)	Mar. 31, 2016 CAD	Mar. 31, 2016 DKK	Mar. 31, 2016 EUR (€)	Mar. 31, 2016 GBP (£)	Mar. 31, 2016 NOK	Mar. 31, 2016 RUB	Mar. 31, 2016 SGD	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CAD	Dec. 31, 2015 DKK	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 NOK	Dec. 31, 2015 RUB	Dec. 31, 2015 SGD
Derivative [Line Items]
Foreign currency, Cash flow hedging	$ 211	CAD 1	DKK 35	€ 69	£ 2	NOK 8,376		SGD 12	$ 321	CAD 2	DKK 57	€ 78	£ 4	NOK 9,655		SGD 14
Foreign currency, Non-designated hedging	$ 496	CAD 11	DKK 221	€ 223	£ 16	NOK 2,474	RUB 2,097	SGD 2	$ 515	CAD 7	DKK 153	€ 371	£ 11	NOK 2,265	RUB 2,164	SGD 5

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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=56946850&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=49121117&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=49121117&loc=d3e13495-108611

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