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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Company's pension and postretirement benefit plans
Components of net cost (benefit) for pension and other postretirement plans
 
 
Three months ended March 31,
($ in millions)

 
2020
 
2019
Pension benefits
 
 
 
 
Service cost
 
$
28

 
$
28

Interest cost
 
56

 
65

Expected return on plan assets
 
(104
)
 
(93
)
Amortization of prior service credit
 
(14
)
 
(14
)
Costs and expenses
 
(34
)
 
(14
)
Remeasurement of projected benefit obligation
 
(116
)
 
387

Remeasurement of plan assets
 
434

 
(391
)
Remeasurement (gains) losses
 
318

 
(4
)
Pension net cost (benefit)
 
$
284

 
$
(18
)
 
 
 
 
 
Postretirement benefits
 
 
 
 
Service cost
 
$
1

 
$
2

Interest cost
 
3

 
4

Amortization of prior service credit
 
(1
)
 
(1
)
Costs and expenses
 
3

 
5

Remeasurement of projected benefit obligation
 
—

 
19

Remeasurement of plan assets
 
—

 
—

Remeasurement (gains) losses
 
—

 
19

Postretirement net cost
 
$
3

 
$
24

 
 
 
 
 
Pension and postretirement benefits
 
 
 
 
Costs and expenses
 
$
(31
)
 
$
(9
)
Remeasurement (gains) losses
 
318

 
15

Total net cost
 
$
287

 
$
6


Differences between expected and actual returns on plan assets and changes in assumptions affect the Company’s pension and other postretirement obligations, plan assets and expenses.
Pension and postretirement benefits remeasurement gains and losses
 
 
 
 
 
 
Three months ended March 31,
($ in millions)
 
2020
 
2019
Remeasurement of projected benefit obligation (gains) losses - discount rate
 
$
(36
)
 
$
265

Remeasurement of projected benefit obligation (gains) losses - other assumptions
 
(80
)
 
141

Remeasurement of plan assets (gains) losses
 
434

 
(391
)
Remeasurement (gains) losses
 
$
318

 
$
15