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Stockholders' Equity - Summary of Common Stock (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Series A [Member] |  |
Disclosure of Classes of Share Capital [Line Items] |  |
Subscribed and paid shares | 30,002,628,318 | 30,214,469,912
Unissued shares authorized for executives' stock compensation programs | 936,375,524 | 531,739,616
Repurchased shares | 307,207,506 | 0
Shares that guarantee the issuance of convertible securities | 4,529,603,200 | 4,529,605,020
Shares authorized for the issuance of stock or convertible securities | 302,144,720 | 0
Number of shares issued | 36,077,959,268 | 35,275,814,548
Series B [Member] |  |
Disclosure of Classes of Share Capital [Line Items] |  |
Subscribed and paid shares | 15,001,314,159 | 15,107,234,956
Unissued shares authorized for executives' stock compensation programs | 468,187,762 | 265,869,808
Repurchased shares | 153,603,753 | 0
Shares that guarantee the issuance of convertible securities | 2,264,801,600 | 2,264,802,510
Shares authorized for the issuance of stock or convertible securities | 151,072,360 | 0
Number of shares issued | 18,038,979,634 | 17,637,907,274

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