Earnings per common share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Year Ended December 31,
(Dollars in millions, except per share, shares in thousands)	2023			2022			2021
Income available to common shareholders:
Net income	$	2,741		$	1,992		$	1,859
Less: Preferred stock dividends		(100	)		(97	)		(73	)
Net income available to common equity		2,641			1,895			1,786
Less: Income attributable to unvested stock-based    compensation awards		(5	)		(4	)		(9	)
Net income available to common shareholders	$	2,636		$	1,891		$	1,777
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		166,662			163,489			129,539
Less: Unvested stock-based compensation awards		(301	)		(315	)		(890	)
Weighted-average shares outstanding		166,361			163,174			128,649
Basic earnings per common share	$	15.85		$	11.59		$	13.81

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Year Ended December 31,
(Dollars in millions, except per share, shares in thousands)	2023			2022			2021
Net income available to common equity	$	2,641		$	1,895		$	1,786
Less: Income attributable to unvested stock-based    compensation awards		(5	)		(4	)		(9	)
Net income available to common shareholders	$	2,636		$	1,891		$	1,777
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		166,662			163,489			129,539
Less: Unvested stock-based compensation awards		(301	)		(315	)		(890	)
Plus: Incremental shares from assumed conversion of    stock-based compensation awards and warrants to    purchase common stock		641			856			163
Adjusted weighted-average shares outstanding		167,002			164,030			128,812
Diluted earnings per common share	$	15.79		$	11.53		$	13.80