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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [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,
 
2017
 
2016
 
2017
 
2016
Pension benefits
 
 
 
 
 
 
 
Service cost
$
28

 
$
28

 
$
85

 
$
84

Interest cost
66

 
71

 
198

 
214

Expected return on plan assets
(102
)
 
(99
)
 
(306
)
 
(298
)
Amortization of:
 

 
 

 
 
 
 
Prior service credit
(14
)
 
(14
)
 
(42
)
 
(42
)
Net actuarial loss
48

 
44

 
142

 
131

Settlement loss
94

 
7

 
110

 
23

Net periodic pension cost
$
120

 
$
37

 
$
187

 
$
112

 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
Service cost
$
2

 
$
2

 
$
6

 
$
7

Interest cost
4

 
4

 
11

 
13

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(6
)
 
(5
)
 
(18
)
 
(16
)
Net actuarial gain
(6
)
 
(2
)
 
(18
)
 
(18
)
Net periodic postretirement credit
$
(6
)
 
$
(1
)
 
$
(19
)
 
$
(14
)