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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Employee Benefit Plans [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Stock-based compensation expense recognized in noninterest expense consisted of the following:
 
Three Months Ended March 31
(Dollars in millions)
2017
 
2016
RSUs

$34

 

$18

Phantom stock units 1
24

 
7

Restricted stock
—

 
2

Total stock-based compensation

$58

 

$27

 
 
 
 
Stock-based compensation tax benefit

$22

 

$10

1 Phantom stock units are settled in cash.
Schedule of Net Benefit Costs [Table Text Block]
Components of net periodic benefit related to the Company's pension and other postretirement benefits plans are presented in the following table:
 
Three Months Ended March 31
 
Pension Benefits 1
 
Other Postretirement Benefits
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Service cost

$1

 

$1

 

$—

 

$—

Interest cost
24

 
24

 
—

 
—

Expected return on plan assets
(48
)
 
(46
)
 
(1
)
 
(1
)
Amortization of prior service credit
—

 
—

 
(1
)
 
(1
)
Amortization of actuarial loss
6

 
6

 
—

 
—

Net periodic benefit

($17
)
 

($15
)
 

($2
)
 

($2
)
1 Administrative fees are recognized in service cost for each of the periods presented.