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Benefit Plans
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Benefit Plans
Benefit Plans
The components of net periodic cost for the Company’s pension and postretirement benefit plans are as follows:
($ in millions)
Three months ended June 30,
 
Six months ended June 30,
 
2017
 
2016
 
2017
 
2016
Pension benefits
 
 
 
 
 
 
 
Service cost
$
28

 
$
28

 
$
57

 
$
56

Interest cost
66

 
72

 
132

 
143

Expected return on plan assets
(102
)
 
(100
)
 
(204
)
 
(199
)
Amortization of:
 

 
 

 
 
 
 
Prior service credit
(14
)
 
(14
)
 
(28
)
 
(28
)
Net actuarial loss
47

 
44

 
94

 
87

Settlement loss
8

 
8

 
16

 
16

Net periodic pension cost
$
33

 
$
38

 
$
67

 
$
75

 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
Service cost
$
2

 
$
3

 
$
4

 
$
5

Interest cost
3

 
5

 
7

 
9

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(6
)
 
(6
)
 
(12
)
 
(11
)
Net actuarial gain
(6
)
 
(8
)
 
(12
)
 
(16
)
Net periodic postretirement credit
$
(7
)
 
$
(6
)
 
$
(13
)
 
$
(13
)