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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The cost to the company of its pension and other postretirement benefit (OPB) plans is shown in the following table:
 
Three Months Ended March 31
 
Pension
Benefits
 
OPB
$ in millions
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost (benefit)
 
 
 
 
 
 
 
Service cost
$
102

 
$
92

 
$
4

 
$
4

Interest cost
307

 
340

 
17

 
20

Expected return on plan assets
(594
)
 
(525
)
 
(26
)
 
(23
)
Amortization of prior service credit
(15
)
 
(15
)
 
1

 
(1
)
Net periodic benefit cost (benefit)
$
(200
)
 
$
(108
)
 
$
(4
)
 
$
—
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended March 31
$ in millions
2020
 
2019
Defined benefit pension plans
$
20

 
$
23

OPB plans
12

 
12

Defined contribution plans
256

 
191