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Common stock (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, beginning balance | 651,450 | 665,901 | 678,523
Treasury shares, beginning balance | (59,886) | (48,788) | (34,592)
Shares outstanding, beginning balance | 591,564 | 617,113 | 643,931
Conversions of Class A to Class B common stock | (12,122) | (14,451) | (12,622)
Conversions of Class A to Class B common stock, Outstanding | (12,122) | (14,451) | (12,622)
Treasury stock acquired | (11,667) | (11,098) | (14,196)
Shares issued, ending balance | 639,328 | 651,450 | 665,901
Treasury shares, ending balance | (71,553) | (59,886) | (48,788)
Shares outstanding, ending balance | 567,775 | 591,564 | 617,113
Class B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares issued, beginning balance | 1,509,969,352 | 1,488,292,852 | 1,469,359,852
Treasury shares, beginning balance | (207,715,276) | (197,818,349) | (119,316,381)
Shares outstanding, beginning balance | 1,302,254,076 | 1,290,474,503 | 1,350,043,471
Conversions of Class A to Class B common stock | 18,183,000 | 21,676,500 | 18,933,000
Conversions of Class A to Class B common stock, Outstanding | 18,183,000 | 21,676,500 | 18,933,000
Treasury stock acquired | (9,875,568) | (9,896,927) | (78,501,968)
Shares issued, ending balance | 1,528,152,352 | 1,509,969,352 | 1,488,292,852
Treasury shares, ending balance | (217,590,844) | (207,715,276) | (197,818,349)
Shares outstanding, ending balance | 1,310,561,508 | 1,302,254,076 | 1,290,474,503

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