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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Earnings Per Share [Abstract] |  |  |  |
Net income available to common equity | $ 628 | $ 842 | $ 1,134 | $ 1,519
Less: Income attributable to unvested stock-based compensation awards | (2) | (1) | (3) | (3)
Net income available to common shareholders | $ 626 | $ 841 | $ 1,131 | $ 1,516
Adjusted weighted-average shares outstanding: |  |  |  |
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards | 167,282 | 166,152 | 167,010 | 167,076
Less: Unvested stock-based compensation awards | (331) | (310) | (305) | (294)
Plus: Incremental shares from assumed conversion of stock-based compensation awards | 708 | 478 | 667 | 577
Adjusted weighted-average shares outstanding (in shares) | 167,659 | 166,320 | 167,372 | 167,359
Diluted earnings per common share (in USD per share) | $ 3.73 | $ 5.05 | $ 6.76 | $ 9.06

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