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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 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 employee compensation in the Consolidated Statements of Income consisted of the following:
 
Three Months Ended September 30
 
Nine Months Ended September 30
(Dollars in millions)
2017
 
2016
 
2017
 
2016
RSUs

$14

 

$13

 

$64

 

$44

Phantom stock units 1
17

 
16

 
57

 
39

Restricted stock
—

 
—

 
—

 
2

Total stock-based compensation expense

$31

 

$29

 

$121

 

$85

 
 
 
 
 
 
 
 
Stock-based compensation tax benefit 2

$12

 

$11

 

$46

 

$32

1 Phantom stock units are settled in cash.
2 Does not include excess tax benefits or deficiencies recognized in the Provision for income taxes in the Consolidated Statements of Income.
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 and are recognized in employee benefits in the Consolidated Statements of Income:
 
Pension Benefits 1
 
Other Postretirement Benefits
 
Three Months Ended September 30
 
Nine Months Ended September 30
 
Three Months Ended September 30
 
Nine Months Ended September 30
(Dollars in millions)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost

$1

 

$1

 

$4

 

$4

 

$—

 

$—

 

$—

 

$—

Interest cost
24

 
24

 
71

 
73

 
—

 
—

 
1

 
1

Expected return on plan assets
(49
)
 
(46
)
 
(146
)
 
(140
)
 
(1
)
 
(1
)
 
(4
)
 
(3
)
Amortization of prior service credit
—

 
—

 
—

 
—

 
(1
)
 
(1
)
 
(4
)
 
(4
)
Amortization of actuarial loss
6

 
6

 
18

 
19

 
—

 
—

 
—

 
—

Net periodic benefit

($18
)
 

($15
)
 

($53
)
 

($44
)
 

($2
)
 

($2
)
 

($7
)
 

($6
)
1 Administrative fees are recognized in service cost for each of the periods presented.