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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Company's pension and postretirement benefit plans
Components of net periodic cost included in operating costs and expenses
 
 
Three months ended September 30,
 
Nine months ended September 30,
($ in millions)

 
2018
 
2017
 
2018
 
2017
Pension benefits
 
 
 
 
 
 
 
 
Service cost
 
$
29

 
$
28

 
$
85

 
$
85

Interest cost
 
60

 
66

 
181

 
198

Expected return on plan assets
 
(105
)
 
(102
)
 
(316
)
 
(306
)
Amortization of:
 
 

 
 

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

 
48

 
132

 
142

Settlement loss
 
68

 
94

 
82

 
110

Net periodic pension cost
 
$
81

 
$
120

 
$
122

 
$
187

 
 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
 
Service cost
 
$
2

 
$
2

 
$
6

 
$
6

Interest cost
 
3

 
4

 
10

 
11

Amortization of:
 
 
 
 
 
 
 
 
Prior service credit
 
(5
)
 
(6
)
 
(16
)
 
(18
)
Net actuarial gain
 
(6
)
 
(6
)
 
(17
)
 
(18
)
Net periodic postretirement credit
 
$
(6
)
 
$
(6
)
 
$
(17
)
 
$
(19
)

During the third quarter of 2018, the Company concluded that its qualified employee pension plan 2018 lump sum payments are expected to exceed a threshold of service and interest cost due to higher-than-expected retirement levels and rising interest rates that reduce benefit lump sum payments in the future.
As a result, a pension settlement loss of $61 million, pre-tax, was recorded as part of operating costs and expenses in the Corporate and Other segment.
The Company will continue to monitor lump sum payments through the end of the year and will recognize an additional settlement loss based on lump sum payments made during the fourth quarter of 2018.
During the third quarter of 2017, the Company also recorded a pension settlement loss in the amount of $86 million, pre-tax, related to higher levels of lump sum payments in the qualified employee pension plan.