Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016:

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
			$	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, 2016
Shares available for future grants (in thousands)	16,627
Vesting period, awards granted prior to 2010	5.0	yrs
Vesting period, awards granted after 2009 (minimum years)	1.0
Vesting period, awards granted after 2009 (maximum years)	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:

	Year Ended December 31,
	2016		2015		2014
	(Dollars in millions)
Equity-based compensation expense	$	115	$	106	$	102
Income tax benefit from equity-based compensation expense	43		40		39
Intrinsic value of options exercised and RSUs that vested during the year	159		170		280
Grant date fair value of equity-based awards that vested during the year	98		115		113
			December 31,
			2016		2015
			(Dollars in millions)
Unrecognized compensation cost related to equity-based awards			$	109	$	103
Weighted-average life over which compensation cost is expected to be recognized (years)			2.3		2.2

Stock Options Activity Roll Forward

The following tables present the activity during 2016 related to equity-based compensation awards:

	Options		Wtd. Avg. Exercise Price Per Share		Aggregate Intrinsic Value		Wtd. Avg. Remaining Contractual Life
	(Dollars in millions, except per share data, shares in thousands)
Outstanding at January 1, 2016	20,577		$	34.89
Replacement awards granted in connection with acquisitions	566		36.12
Granted	610		32.10
Exercised	(7,101	)	34.87
Forfeited or expired	(2,856	)	40.64
Outstanding at December 31, 2016	11,796		33.42		$	166	3.47	yrs
Exercisable at December 31, 2016	11,023		33.36		156		3.11
Exercisable and expected to vest at December 31, 2016	11,755		33.42		166		3.46

Restricted Shares and RSUs Activity Roll Forward

	Restricted Shares/Units		Wtd. Avg. Grant Date Fair Value
	(Shares in thousands)
Nonvested at January 1, 2016	11,824		$	29.81
Granted	5,235		27.49
Vested	(3,150	)	27.76
Forfeited	(393	)	29.74
Nonvested at December 31, 2016	13,516		29.39
Expected to vest at December 31, 2016	12,384		29.39