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Stockholders' Equity - Summary of Common Stock (Detail) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Series A [Member] |  |
Disclosure of Classes of Share Capital [Line Items] |  |
Subscribed and paid shares | 29,457,941,452 | 29,457,941,452
Unissued shares authorized for executives' stock compensation programs | 881,442,830 | 881,442,830
Repurchased shares | 0 | 756,323,120
Shares that guarantee/guaranteed the issuance of convertible securities | 0 | 1,970,862,596
Shares authorized for the issuance of stock or convertible securities | 0 | 302,144,720
Number of shares issued | 30,339,384,282 | 33,368,714,718
Series B [Member] |  |
Disclosure of Classes of Share Capital [Line Items] |  |
Subscribed and paid shares | 14,728,970,726 | 14,728,970,726
Unissued shares authorized for executives' stock compensation programs | 440,721,415 | 440,721,415
Repurchased shares | 0 | 378,161,560
Shares that guarantee/guaranteed the issuance of convertible securities | 0 | 985,431,298
Shares authorized for the issuance of stock or convertible securities | 0 | 151,072,360
Number of shares issued | 15,169,692,141 | 16,684,357,359

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