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Employee Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
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 June 30,
 
Six months ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Service cost
 
$
3

 
$
3

 
$
6

 
$
5

Interest cost
 
4

 
3

 
7

 
7

Expected return on plan assets
 
(5
)
 
(4
)
 
(9
)
 
(8
)
Amortization of actuarial loss and prior service
  cost
 
2

 
0

 
3

 
1

Net periodic benefit cost
 
$
4

 
$
2

 
$
7

 
$
5