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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member] € in Millions, ¥ in Millions, £ in Millions, ZAR in Millions, SGD in Millions, RUB in Millions, NOK in Millions, DKK in Millions, CAD in Millions, $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 NOK	Dec. 31, 2017 DKK	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 RUB	Dec. 31, 2017 ZAR	Dec. 31, 2016 USD ($)	Dec. 31, 2016 JPY (¥)	Dec. 31, 2016 NOK	Dec. 31, 2016 SGD	Dec. 31, 2016 DKK	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 RUB	Dec. 31, 2016 ZAR	Dec. 31, 2016 CAD
Derivative [Line Items]
Foreign currency, Cash flow hedging	$ 163	¥ 982	NOK 4,013	DKK 30	€ 120	£ 11			$ 321	¥ 1,462	NOK 5,621	SGD 2	DKK 29	€ 279	£ 1
Foreign currency, Non-designated hedging	$ 463		NOK 1,734	DKK 15	€ 99	£ 3	RUB 2,699	ZAR 150	$ 457		NOK 538	SGD 7	DKK 49	€ 272	£ 3	RUB 1,893	ZAR 150	CAD 1

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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.

+ References

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=84234895&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=77997519&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=77997519&loc=d3e13495-108611

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