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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 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 September 30
 
Nine Months Ended September 30
 
Pension
Benefits
 
OPB
 
Pension
Benefits
 
OPB
$ in millions
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost (benefit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
102

 
$
92

 
$
4

 
$
4

 
$
306

 
$
276

 
$
13

 
$
12

Interest cost
307

 
340

 
17

 
20

 
920

 
1,020

 
50

 
60

Expected return on plan assets
(594
)
 
(525
)
 
(26
)
 
(23
)
 
(1,782
)
 
(1,576
)
 
(77
)
 
(69
)
Amortization of prior service credit
(15
)
 
(15
)
 
1

 
(1
)
 
(45
)
 
(44
)
 
3

 
(2
)
Net periodic benefit cost (benefit)
$
(200
)
 
$
(108
)
 
$
(4
)
 
$
—

 
$
(601
)
 
$
(324
)
 
$
(11
)
 
$
1
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended September 30
 
Nine Months Ended September 30
$ in millions
2020
 
2019
 
2020
 
2019
Defined benefit pension plans
$
24

 
$
18

 
$
70

 
$
64

OPB plans
7

 
10

 
30

 
34

Defined contribution plans
116

 
98

 
472

 
377