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Employee Pension and Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Pension and Other Postretirement Benefits
Employee Pension and Other Postretirement Benefits
The following table summarizes the components of net periodic benefit cost for the three months ended March 31, 2017 and 2016.
 
 
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)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
19

 
$
23

 
$
2

 
$
2

 
$
—

 
$
1

Interest cost
 
25

 
26

 
2

 
3

 
1

 
—

Expected return on plan assets
 
(64
)
 
(60
)
 
(5
)
 
(5
)
 
—

 
—

Amortization of prior service credit
 
(7
)
 
(4
)
 
(5
)
 
(2
)
 
—

 
—

Recognized net actuarial loss
 
19

 
19

 
3

 
2

 
1

 
1

Total net periodic benefit cost          
 
$
(8
)
 
$
4

 
$
(3
)
 
$
—

 
$
2

 
$
2