Earnings per common share (Tables)

6 Months Ended

Jun. 30, 2018

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
	2018			2017			2018			2017
	(In thousands, except per share)
Income available to common shareholders:
Net income	$	493,160			381,053			845,770			729,980
Less: Preferred stock dividends (a)		(18,130	)		(18,237	)		(36,260	)		(36,474	)
Net income available to common equity		475,030			362,816			809,510			693,506
Less: Income attributable to unvested stock-based    compensation awards		(2,432	)		(2,158	)		(4,172	)		(4,298	)
Net income available to common shareholders	$	472,598			360,658			805,338			689,208
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		145,571			153,770			147,510			154,612
Less: Unvested stock-based compensation awards		(746	)		(913	)		(764	)		(974	)
Weighted-average shares outstanding		144,825			152,857			146,746			153,638
Basic earnings per common share	$	3.26			2.36			5.49			4.49

 (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:

	Three Months Ended June 30						Six Months Ended June 30
	2018			2017			2018			2017
	(In thousands, except per share)
Net income available to common equity	$	475,030			362,816			809,510			693,506
Less: Income attributable to unvested stock-based    compensation awards		(2,430	)		(2,154	)		(4,168	)		(4,289	)
Net income available to common shareholders	$	472,600			360,662			805,342			689,217
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		145,571			153,770			147,510			154,612
Less: Unvested stock-based compensation awards		(746	)		(913	)		(764	)		(974	)
Plus: Incremental shares from assumed conversion of    stock-based compensation awards and warrants to    purchase common stock		173			419			195			470
Adjusted weighted-average shares outstanding		144,998			153,276			146,941			154,108
Diluted earnings per common share	$	3.26			2.35			5.48			4.47