v3.25.4
Common Shares - Shares Outstanding (Detail)
 1 Months Ended 12 Months Ended
Dec. 19, 2025
shares
Jan. 03, 2025
shares
Mar. 05, 2024
shares
Feb. 28, 2023
shares
Dec. 31, 2025
shares
Dec. 31, 2025
shares
Dec. 31, 2024
shares
Reconciliation of number of shares outstanding [abstract]              
Common shares cancelled (in shares)         37,700,000    
Issued and
fully paid              
Reconciliation of number of shares outstanding [abstract]              
Common shares, beginning balance (in shares)           1,994,701,593 2,040,242,959
Number of share options exercised in share-based payment arrangement (in shares)           0 0
Increase (decrease) in number of shares outstanding (in shares)           0 0
Common shares cancelled (in shares) 37,700,000 46,400,000 45,500,000 26,500,000   84,122,616 45,541,366
Shares purchased for treasury (in shares)           0 0
Shares sold or distributed from treasury (in shares)           0 0
Common shares, ending balance (in shares)         1,910,578,977 1,910,578,977 1,994,701,593
Common shares
in treasury,
at cost              
Reconciliation of number of shares outstanding [abstract]              
Common shares, beginning balance (in shares)           49,575,838 48,195,109
Number of share options exercised in share-based payment arrangement (in shares)           0 0
Increase (decrease) in number of shares outstanding (in shares)           0 0
Common shares cancelled (in shares)           84,122,616 45,541,366
Shares purchased for treasury (in shares)           (76,926,379) (86,796,707)
Shares sold or distributed from treasury (in shares)           34,673,888 39,874,612
Common shares, ending balance (in shares)         7,705,713 7,705,713 49,575,838
Outstanding              
Reconciliation of number of shares outstanding [abstract]              
Common shares, beginning balance (in shares)           1,945,125,755 1,992,047,850
Number of share options exercised in share-based payment arrangement (in shares)           0 0
Increase (decrease) in number of shares outstanding (in shares)           0 0
Common shares cancelled (in shares)           0 0
Shares purchased for treasury (in shares)           (76,926,379) (86,796,707)
Shares sold or distributed from treasury (in shares)           34,673,888 39,874,612
Common shares, ending balance (in shares)         1,902,873,264 1,902,873,264 1,945,125,755