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Income Taxes - Summary of the Balances of the Deferred tax Assets and Liabilities in Statement of Financial Position (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Deferred Tax Assets And Liabilities [line items] |  |
Asset | $ 740 | $ 627
Liability | (658) | (720)
Net | 82 | (93)
Country of domicile [member] |  |
Disclosure of Deferred Tax Assets And Liabilities [line items] |  |
Asset | 152 | 189
Liability | (229) | (346)
Net | (77) | (157)
Foreign countries [member] |  |
Disclosure of Deferred Tax Assets And Liabilities [line items] |  |
Asset | 588 | 438
Liability | (429) | (374)
Net | $ 159 | $ 64

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