Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Three Months Ended March 31,
(Dollars in millions, except per share, shares in thousands)	2024			2023
Income available to common shareholders:
Net income	$	531		$	702
Less: Preferred stock dividends		(25	)		(25	)
Net income available to common equity		506			677
Less: Income attributable to unvested stock-based    compensation awards		(1	)		(1	)
Net income available to common shareholders	$	505		$	676
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		166,738			168,010
Less: Unvested stock-based compensation awards		(278	)		(278	)
Weighted-average shares outstanding		166,460			167,732
Basic earnings per common share	$	3.04		$	4.03

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Three Months Ended March 31,
(Dollars in millions, except per share, shares in thousands)	2024			2023
Net income available to common equity	$	506		$	677
Less: Income attributable to unvested stock-based    compensation awards		(1	)		(1	)
Net income available to common shareholders	$	505		$	676
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		166,738			168,010
Less: Unvested stock-based compensation awards		(278	)		(278	)
Plus: Incremental shares from assumed conversion    of stock-based compensation awards		624			678
Adjusted weighted-average shares outstanding		167,084			168,410
Diluted earnings per common share	$	3.02		$	4.01