v3.26.1
Common stock (Detail)
 3 Months Ended
Mar. 31, 2026
shares
Class A [Member]  
Class of Stock [Line Items]  
Shares issued, beginning balance 592,175
Treasury shares, beginning balance (76,340)
Shares outstanding, beginning balance 515,835
Conversions of Class A to Class B common stock (9,851)
Conversions of Class A to Class B common stock, Outstanding (9,851)
Treasury stock acquired (33)
Shares issued, ending balance 582,324
Treasury shares, ending balance (76,373)
Shares outstanding, ending balance 505,951
Class B [Member]  
Class of Stock [Line Items]  
Shares issued, beginning balance 1,598,881,852
Treasury shares, beginning balance (215,299,213)
Shares outstanding, beginning balance 1,383,582,639
Conversions of Class A to Class B common stock 14,776,500
Conversions of Class A to Class B common stock, Outstanding 14,776,500
Treasury stock acquired (431,462)
Shares issued, ending balance 1,613,658,352
Treasury shares, ending balance (215,730,675)
Shares outstanding, ending balance 1,397,927,677