Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Summary of Non-Cumulative Perpetual Preferred Stock

The following table presents a summary of the non-cumulative perpetual preferred stock as of December 31, 2017:

Preferred Stock Issue	Issuance Date	Earliest Redemption Date	Liquidation Amount		Carrying Amount		Dividend Rate
(Dollars in millions)
Series D	5/1/2012	5/1/2017	$	575	$	559	5.850	%
Series E	7/31/2012	8/1/2017	1,150		1,120		5.625
Series F	10/31/2012	11/1/2017	450		437		5.200
Series G	5/1/2013	6/1/2018	500		487		5.200
Series H	3/9/2016	6/1/2021	465		450		5.625
Total			$	3,140	$	3,053

Summary of Selected Information Pertaining to Equity-based Compensation Plans

The following table provides a summary of the equity-based compensation plans:

	December 31, 2017
Shares available for future grants (in thousands)	19,408
Vesting period, minimum	1.0	years
Vesting period, maximum	5.0
Option term	10.0

Summary of Selected Data Related to Equity-based Compensation Costs

A summary of selected data related to equity-based compensation costs follows:

	As of / For the Year Ended December 31,
(Dollars in millions)	2017		2016		2015
Equity-based compensation expense	$	132	$	115	$	106
Income tax benefit from equity-based compensation expense	34		43		40
Intrinsic value of options exercised, and RSUs and PSUs that vested during the year	261		159		170
Grant date fair value of equity-based awards that vested during the year	116		98		115
Unrecognized compensation cost related to equity-based awards	132		109		103
Weighted-average life over which compensation cost is expected to be recognized (years)	2.4		2.3		2.2

Rollforward of RSUs, PSUs amd Restricted Shares

The following table presents the activity during 2017 related to awards of RSUs, PSUs and restricted shares:

(Shares/units in thousands)	Shares/Units		Wtd. Avg. Grant Date Fair Value
Nonvested at January 1, 2017	13,516		$	29.39
Granted	3,924		42.88
Vested	(4,142	)	27.75
Forfeited	(350	)	33.29
Nonvested at December 31, 2017	12,948		33.90
Expected to vest at December 31, 2017	11,946		33.90