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Segmental Information - Summary of Information by Reportable Segment - Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of operating segments [line items] |  |
Assets held for sale | $ 19 |
Liabilitites classified as held for sale | 22 |
EMEAA [member] |  |
Disclosure of operating segments [line items] |  |
Assets held for sale | 19 | $ 0
Liabilitites classified as held for sale | $ 22 | $ 0

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