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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Common stock, shares authorized | 4,500,000,000 |  |
Common stock, par value | $ 0.01 |  |
Common stock, shares outstanding | 1,392,325,960 | 1,384,515,345 |
Preferred stock, shares authorized | 200,000,000 |  |
Preferred stock, par value | $ 0.01 |  |
Preferred stock, issued | 0 |  |
Other comprehensive income (loss) | $ (447) | $ 184 | $ (239)

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