Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders

Reconciliations of net income to net income available to common shareholders and the difference between average basic common shares outstanding and average diluted common shares outstanding are presented in the following table.

	Year Ended December 31
(Dollars and shares in millions, except per share data)	2017			2016			2015
Net income		$2,273			$1,878			$1,933
Less:
Preferred stock dividends	(94		)	(66		)	(64		)
Dividends and undistributed earnings allocated to unvested common share awards	—			(1		)	(6		)
Net income available to common shareholders		$2,179			$1,811			$1,863
Average common shares outstanding - basic	481.3			498.6			514.8
Add dilutive securities:
RSUs	3.0			2.9			2.6
Common stock warrants and restricted stock	1.8			0.6			1.7
Stock options	0.9			1.4			1.5
Average common shares outstanding - diluted	487.0			503.5			520.6
Net income per average common share - diluted		$4.47			$3.60			$3.58
Net income per average common share - basic	4.53			3.63			3.62