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Earnings per common share - Computations of Basic Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income available to common shareholders:        
Net income $ 792,000 $ 721,000 $ 2,092,000 $ 1,907,000
Less: Preferred stock dividends (36,000) (47,000) (107,000) (99,000)
Net income available to common equity 756,000 674,000 1,985,000 1,808,000
Less: Income attributable to unvested stock-based compensation awards (2,000) 0 (4,000) (3,000)
Net income available to common shareholders $ 754,000 $ 674,000 $ 1,981,000 $ 1,805,000
Weighted-average shares outstanding:        
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards (in shares) 155,885 167,011 159,956 167,010
Less: Unvested stock-based compensation awards (in shares) (327) (340) (325) (316)
Weighted-average shares outstanding (in shares) 155,558 166,671 159,631 166,694
Basic earnings per common share (in USD per share) $ 4.85 $ 4.04 $ 12.41 $ 10.83