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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following summarizes the components of net periodic benefit cost for our qualified and supplemental pension plans:
(Dollars in millions)
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
3

 
$
3

 
$
8

 
$
8

Interest cost
 
4

 
4

 
11

 
11

Expected return on plan assets
 
(6
)
 
(5
)
 
(16
)
 
(14
)
Amortization of actuarial loss and prior service
 cost
 
1

 
0

 
2

 
2

Net periodic benefit cost
 
$
2

 
$
2

 
$
5

 
$
7