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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [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,
 
2017
 
2016
Service cost
$
3

 
$
3

Interest cost
3

 
3

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

 
1

Net periodic benefit cost
$
2

 
$
2