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Benefit Plans
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [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 September 30,
 
Nine months ended September 30,
 
2016
 
2015
 
2016
 
2015
Pension benefits
 
 
 
 
 
 
 
Service cost
$
28

 
$
29

 
$
84

 
$
86

Interest cost
71

 
64

 
214

 
192

Expected return on plan assets
(99
)
 
(106
)
 
(298
)
 
(318
)
Amortization of:
 

 
 

 
 
 
 
Prior service credit
(14
)
 
(14
)
 
(42
)
 
(42
)
Net actuarial loss
44

 
47

 
131

 
143

Settlement loss
7

 
6

 
23

 
18

Net periodic pension cost
$
37

 
$
26

 
$
112

 
$
79

 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
Service cost
$
2

 
$
3

 
$
7

 
$
9

Interest cost
4

 
6

 
13

 
17

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(5
)
 
(16
)
 
(16
)
Net actuarial gain
(2
)
 
(3
)
 
(18
)
 
(7
)
Net periodic postretirement (credit) cost
$
(1
)
 
$
1

 
$
(14
)
 
$
3