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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member] ₽ in Millions, € in Millions, ¥ in Millions, £ in Millions, kr in Millions, kr in Millions, R in Millions, $ in Millions	Mar. 31, 2018 USD ($)	Mar. 31, 2018 DKK (kr)	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 GBP (£)	Mar. 31, 2018 JPY (¥)	Mar. 31, 2018 NOK (kr)	Mar. 31, 2018 ZAR (R)	Mar. 31, 2018 RUB (₽)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 DKK (kr)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 NOK (kr)	Dec. 31, 2017 ZAR (R)	Dec. 31, 2017 RUB (₽)
Derivative [Line Items]
Foreign currency, Cash flow hedging	$ 113	kr 19	€ 83	£ 9	¥ 968	kr 3,556			$ 163	kr 30	€ 120	£ 11	¥ 982	kr 4,013
Foreign currency, Non-designated hedging	$ 469	kr 33	€ 106	£ 4		kr 1,407	R 176	₽ 2,903	$ 463	kr 15	€ 99	£ 3		kr 1,734	R 150	₽ 2,699

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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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