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Stockholders' Equity - Summary of Breakdown of Common Stock and Additional Paid-in Capital (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [abstract] |  |
Common stock | $ 318 | $ 318
Additional paid-in capital | 7,575 | 10,106
Common stock and additional paid-in capital | $ 7,893 | $ 10,424

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