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Financial Instruments - Summary of Derivative Financial Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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 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 + Details
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