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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six Months Ended June 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

 
$
5

 
$
4

 
$
204

 
$
184

 
$
9

 
$
8

Interest cost
306

 
340

 
16

 
20

 
613

 
680

 
33

 
40

Expected return on plan assets
(594
)
 
(526
)
 
(25
)
 
(23
)
 
(1,188
)
 
(1,051
)
 
(51
)
 
(46
)
Amortization of prior service credit
(15
)
 
(14
)
 
1

 
—

 
(30
)
 
(29
)
 
2

 
(1
)
Net periodic benefit cost (benefit)
$
(201
)
 
$
(108
)
 
$
(3
)
 
$
1

 
$
(401
)
 
$
(216
)
 
$
(7
)
 
$
1
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended June 30
 
Six Months Ended June 30
$ in millions
2020
 
2019
 
2020
 
2019
Defined benefit pension plans
$
26

 
$
23

 
$
46

 
$
46

OPB plans
11

 
12

 
23

 
24

Defined contribution plans
100

 
88

 
356

 
279