Earnings per common share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Year Ended December 31
	2018			2017			2016
	(In thousands, except per share)
Income available to common shareholders:
Net income	$	1,918,080		$	1,408,306		$	1,315,114
Less: Preferred stock dividends(a)		(72,521	)		(72,734	)		(81,270	)
Net income available to common equity		1,845,559			1,335,572			1,233,844
Less: Income attributable to unvested stock-based    compensation awards		(9,531	)		(8,069	)		(10,385	)
Net income available to common shareholders	$	1,836,028		$	1,327,503		$	1,223,459
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		144,740			153,092			158,121
Less: Unvested stock-based compensation awards		(748	)		(933	)		(1,341	)
Weighted-average shares outstanding		143,992			152,159			156,780
Basic earnings per common share	$	12.75		$	8.72		$	7.80

(a) Including impact of not as yet declared cumulative dividends.

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Year Ended December 31
	2018			2017			2016
	(In thousands, except per share)
Net income available to common equity	$	1,845,559		$	1,335,572		$	1,233,844
Less: Income attributable to unvested stock-based    compensation awards		(9,524	)		(8,055	)		(10,363	)
Net income available to common shareholders	$	1,836,035		$	1,327,517		$	1,223,481
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		144,740			153,092			158,121
Less: Unvested stock-based compensation awards		(748	)		(933	)		(1,341	)
Plus: Incremental shares from assumed conversion of    stock-based compensation awards and warrants to    purchase common stock		159			392			524
Adjusted weighted-average shares outstanding		144,151			152,551			157,304
Diluted earnings per common share	$	12.74		$	8.70		$	7.78