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Stockholders' Equity - Summary of Other Equity Reserves (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 26, 2020
Disclosure of reserves within equity [abstract] |  |  |  |
Cumulative translation effect, net of effects from perpetual debentures and deferred income taxes recognized directly in equity (notes 19.2 and 20.4) | $ (1,567) | $ (2,098) |  |
Cumulative actuarial losses | (792) | (593) |  |
Treasury shares repurchased under share repurchase program (note 20.1) | (83) | (50) | $ (75) |
Effects associated with the Parent Company's convertible securities | 0 | 25 |  |
Treasury shares held by subsidiaries | (11) | (8) |  | $ (83)
Other equity reserves | $ (2,453) | $ (2,724) |  |

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