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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, $ in Millions, $ in Millions	Sep. 30, 2018 USD ($)	Sep. 30, 2018 NOK (kr)	Sep. 30, 2018 JPY (¥)	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 DKK (kr)	Sep. 30, 2018 GBP (£)	Sep. 30, 2018 CAD ($)	Sep. 30, 2018 RUB (₽)	Sep. 30, 2018 MXN ($)	Sep. 30, 2018 ZAR (R)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 NOK (kr)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 DKK (kr)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 RUB (₽)	Dec. 31, 2017 ZAR (R)
Derivative [Line Items]
Foreign currency, Cash flow hedging	$ 111	kr 3,875	¥ 326	€ 82	kr 19	£ 9	$ 1				$ 163	kr 4,013	¥ 982	€ 120	kr 30	£ 11
Foreign currency, Non-designated hedging	$ 539	kr 1,708		€ 122	kr 15	£ 8	$ 1	₽ 1,329	$ 285	R 176	$ 463	kr 1,734		€ 99	kr 15	£ 3	₽ 2,699	R 150

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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://fasb.org/us-gaap/role/ref/legacyRef
-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=109980867&loc=SL5624163-113959

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- Definition

Net fair value of all derivative instruments not designated as a hedging instrument.

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