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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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 June 30,
 
Six months ended June 30,
 
2016
 
2015
 
2016
 
2015
Pension benefits
 
 
 
 
 
 
 
Service cost
$
28

 
$
28

 
$
56

 
$
57

Interest cost
72

 
64

 
143

 
128

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

 
 

 
 
 
 
Prior service credit
(14
)
 
(14
)
 
(28
)
 
(28
)
Net actuarial loss
44

 
48

 
87

 
96

Settlement loss
8

 
6

 
16

 
12

Net periodic pension cost
$
38

 
$
26

 
$
75

 
$
53

 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
5

 
$
6

Interest cost
5

 
5

 
9

 
11

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(6
)
 
(5
)
 
(11
)
 
(11
)
Net actuarial gain
(8
)
 
(2
)
 
(16
)
 
(4
)
Net periodic postretirement (credit) cost
$
(6
)
 
$
1

 
$
(13
)
 
$
2