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Financial Instruments - Summary of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	$ 2,230	$ 2,324
Derivative financial instrument, Fair value	(81)	(100)
Net Investment Hedges [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	741	1,154
Derivative financial instrument, Fair value	(42)	(67)
Equity forwards on third party shares [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	27	74
Derivative financial instrument, Fair value	3	1
Interest Rate Swap Contract [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	1,334	1,000
Derivative financial instrument, Fair value	(47)	(35)
Fuels Price Hedging [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	128	96
Derivative financial instrument, Fair value	$ 5	$ 1

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Financial assets liabilities at fair value.

+ References

No definition available.

+ Details

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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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- Details

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- Details

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- Details

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- Details

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