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Net Income Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
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)
2016
 
2015
 
2014
Net income

$1,878

 

$1,933

 

$1,774

Preferred dividends
(66
)
 
(64
)
 
(42
)
Dividends and undistributed earnings allocated to unvested shares
(1
)
 
(6
)
 
(10
)
Net income available to common shareholders

$1,811

 

$1,863

 

$1,722

 
 
 
 
 
 
Average basic common shares
499

 
515

 
528

Effect of dilutive securities:
 
 
 
 
 
Stock options
1

 
2

 
1

Restricted stock, RSUs, and warrants
3

 
4

 
4

Average diluted common shares
503

 
521

 
533

 
 
 
 
 
 
Net income per average common share - diluted

$3.60

 

$3.58

 

$3.23

Net income per average common share - basic
3.63

 
3.62

 
3.26