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Financial Instruments - Summary of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	$ 2,608	$ 1,918
Derivative financial instrument, Fair value	(19)	73
Net Investment Hedges [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	1,249	1,160
Derivative financial instrument, Fair value	2	47
Foreign exchange forwards related to forecasted transactions [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	0	381
Derivative financial instrument, Fair value	0	3
Equity forwards on third party shares [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	111	168
Derivative financial instrument, Fair value	2	7
Interest Rate Swap Contract [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	1,126	137
Derivative financial instrument, Fair value	(8)	16
Fuels Price Hedging [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	122	72
Derivative financial instrument, Fair value	(14)	20
2019 Mandatorily Convertible Securities [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	0	0
Derivative financial instrument, Fair value	$ (1)	$ (20)

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- Definition

Financial assets liabilities at fair value.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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