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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
 
2018
 
2017
Service cost
 
$
3

 
$
3

Non-service costs (benefit):
 
 
 
 
Interest cost
 
3

 
3

Expected return on plan assets
 
(5
)
 
(5
)
Amortization of actuarial loss and prior service cost
 
—

 
1

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

 
$
2