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Earnings per common share (Tables)
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Computations of Basic Earnings Per Common Share
The computations of basic earnings per common share follow:
Three Months Ended June 30,Six Months Ended June 30,
(Dollars in millions, except per share, shares in thousands)2024202320242023
Income available to common shareholders:
Net income$655 $867 $1,186 $1,569 
Less: Preferred stock dividends(27)(25)(52)(50)
Net income available to common equity628 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 
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards167,282 166,152167,010 167,076
Less: Unvested stock-based compensation awards(331)(310)(305)(294)
Weighted-average shares outstanding166,951165,842166,705166,782
Basic earnings per common share$3.75 $5.07 $6.79 $9.09 
Computations of Diluted Earnings Per Common Share
The computations of diluted earnings per common share follow:
Three Months Ended June 30,Six Months Ended June 30,
(Dollars in millions, except per share, shares in thousands)2024 202320242023
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 awards167,282 166,152167,010 167,076
Less: Unvested stock-based compensation awards(331)(310)(305)(294)
Plus: Incremental shares from assumed conversion of stock-based compensation awards708 478667 577
Adjusted weighted-average shares outstanding167,659166,320167,372167,359
Diluted earnings per common share$3.73 $5.05 $6.76 $9.06