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Employee Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
The following table summarizes the components of net periodic benefit cost for the three months ended March 31, 2016 and 2015.
 
 
Pension Benefits
 
Other Postretirement Benefits
 
Superannuation,
SERP and
ESBP
 
 
For the Three Months Ended 
 March 31,
 
For the Three Months Ended 
 March 31,
 
For the Three Months Ended 
 March 31,
(Dollars in millions)
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
23

 
$
25

 
$
2

 
$
2

 
$
1

 
$
—

Interest cost
 
26

 
27

 
3

 
3

 
—

 
—

Expected return on plan assets
 
(60
)
 
(54
)
 
(5
)
 
(5
)
 
—

 
—

Amortization of prior service credit
 
(4
)
 
(4
)
 
(2
)
 
(2
)
 
—

 
—

Recognized net actuarial loss
 
19

 
27

 
2

 
1

 
1

 
1

Total net periodic benefit cost          
 
$
4

 
$
21

 
$
—

 
$
(1
)
 
$
2

 
$
1