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Earnings per common share (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
(Dollars in millions, except per share, shares in thousands)2024202320242023
Income available to common shareholders:
Net income$721 $690 $1,907 $2,259 
Less: Preferred stock dividends(47)(25)(99)(75)
Net income available to common equity674 665 1,808 2,184 
Less: Income attributable to unvested stock-based compensation awards— (1)(3)(4)
Net income available to common shareholders$674 $664 $1,805 $2,180 
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards167,011 166,217167,010 166,787
Less: Unvested stock-based compensation awards(340)(308)(316)(299)
Weighted-average shares outstanding166,671165,909166,694166,488
Basic earnings per common share$4.04 $4.00 $10.83 $13.09 
Computations of Diluted Earnings Per Common Share
The computations of diluted earnings per common share follow:
Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in millions, except per share, shares in thousands)2024 202320242023
Net income available to common equity$674 $665 $1,808 $2,184 
Less: Income attributable to unvested stock-based compensation awards— (1)(3)(4)
Net income available to common shareholders$674 $664 $1,805 $2,180 
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards167,011 166,217167,010 166,787
Less: Unvested stock-based compensation awards(340)(308)(316)(299)
Plus: Incremental shares from assumed conversion of stock-based compensation awards896 661743 605
Adjusted weighted-average shares outstanding167,567166,570167,437167,093
Diluted earnings per common share$4.02 $3.98 $10.78 $13.05