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Employee Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30,
 
Six months ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2

 
$
2

 
$
5

 
$
5

Non-service costs (benefit):
 
 
 
 
 
 
 
 
Interest cost
 
3

 
4

 
6

 
7

Expected return on plan assets
 
(6
)
 
(5
)
 
(11
)
 
(10
)
Amortization of actuarial loss and prior service
  cost
 
1

 
—

 
1

 
1

 Total non-service benefit
 
(2
)
 
(1
)
 
(4
)
 
(2
)
Net periodic benefit cost
 
$
—

 
$
1

 
$
1

 
$
3