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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
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)
2018
 
2017
 
2018
 
2017
RSUs

$21

 

$14

 

$82

 

$64

Phantom stock units 1
10

 
17

 
36

 
57

Total stock-based compensation expense

$31

 

$31

 

$118

 

$121

 
 
 
 
 
 
 
 
Stock-based compensation tax benefit 2

$8

 

$12

 

$28

 

$46

1 Phantom stock units are settled in cash. During the three and nine months ended September 30, 2018, the Company paid $1 million and $76 million, respectively, related to these share-based liabilities. During the three and nine months ended September 30, 2017, the Company paid $2 million and $79 million, respectively, related to these share-based liabilities.
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)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost

$1

 

$1

 

$4

 

$4

 

$—

 

$—

 

$—

 

$—

Interest cost
23

 
24

 
68

 
71

 
—

 
—

 
1

 
1

Expected return on plan assets
(47
)
 
(49
)
 
(140
)
 
(146
)
 
(1
)
 
(1
)
 
(4
)
 
(4
)
Amortization of prior service credit
—

 
—

 
—

 
—

 
(2
)
 
(1
)
 
(5
)
 
(4
)
Amortization of actuarial loss
6

 
6

 
17

 
18

 
—

 
—

 
—

 
—

Net periodic benefit

($17
)
 

($18
)
 

($51
)
 

($53
)
 

($3
)
 

($2
)
 

($8
)
 

($7
)
1 Administrative fees are recognized in service cost for each of the periods presented.