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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Company's pension and postretirement 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,
 
2015
 
2014
 
2015
 
2014
Pension benefits
 
 
 
 
 
 
 
Service cost
$
29

 
$
24

 
$
86

 
$
72

Interest cost
64

 
63

 
192

 
191

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

 
 

 
 
 
 
Prior service credit
(14
)
 
(14
)
 
(42
)
 
(43
)
Net actuarial loss
47

 
29

 
143

 
86

Settlement loss
6

 
11

 
18

 
33

Net periodic pension cost
$
26

 
$
14

 
$
79

 
$
41

 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
9

 
$
8

Interest cost
6

 
6

 
17

 
17

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(5
)
 
(6
)
 
(16
)
 
(17
)
Net actuarial gain
(3
)
 
(6
)
 
(7
)
 
(17
)
Net periodic postretirement cost (credit)
$
1

 
$
(3
)
 
$
3

 
$
(9
)