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Earnings per common share - Computations of Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Earnings Per Share [Abstract] |  |  |  |
Net income available to common equity | $ 681 | $ 628 | $ 1,229 | $ 1,134
Less: Income attributable to unvested stock-based compensation awards | (2) | (2) | (3) | (3)
Net income available to common shareholders | $ 679 | $ 626 | $ 1,226 | $ 1,131
Adjusted weighted-average shares outstanding: |  |  |  |
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards (in shares) | 159,559 | 167,282 | 162,025 | 167,010
Less: Unvested stock-based compensation awards (in shares) | (338) | (331) | (324) | (305)
Plus: Incremental shares from assumed conversion of stock-based compensation awards (in shares) | 784 | 708 | 810 | 667
Adjusted weighted-average shares outstanding (in shares) | 160,005 | 167,659 | 162,511 | 167,372
Diluted earnings per common share (in USD per share) | $ 4.24 | $ 3.73 | $ 7.55 | $ 6.76

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