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Benefit Plans
 6 Months Ended
Jun. 30, 2015
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 June 30,
 
Six months ended June 30,
 
2015
 
2014
 
2015
 
2014
Pension benefits
 
 
 
 
 
 
 
Service cost
$
28

 
$
24

 
$
57

 
$
48

Interest cost
64

 
64

 
128

 
128

Expected return on plan assets
(106
)
 
(100
)
 
(212
)
 
(199
)
Amortization of:
 

 
 

 
 
 
 
Prior service credit
(14
)
 
(14
)
 
(28
)
 
(29
)
Net actuarial loss
48

 
28

 
96

 
57

Settlement loss
6

 
11

 
12

 
22

Net periodic pension cost
$
26

 
$
13

 
$
53

 
$
27

 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
Service cost
$
3

 
$
2

 
$
6

 
$
5

Interest cost
5

 
5

 
11

 
11

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(5
)
 
(11
)
 
(11
)
Net actuarial gain
(2
)
 
(5
)
 
(4
)
 
(11
)
Net periodic postretirement cost (credit)
$
1

 
$
(3
)
 
$
2

 
$
(6
)