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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The cost (benefit) to the company of its retirement 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
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost (benefit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
92

 
$
102

 
$
4

 
$
5

 
$
276

 
$
301

 
$
12

 
$
15

Interest cost
340

 
316

 
20

 
20

 
1,020

 
906

 
60

 
58

Expected return on plan assets
(525
)
 
(571
)
 
(23
)
 
(26
)
 
(1,576
)
 
(1,644
)
 
(69
)
 
(75
)
Amortization of prior service credit
(15
)
 
(15
)
 
(1
)
 
(5
)
 
(44
)
 
(44
)
 
(2
)
 
(16
)
Net periodic benefit cost (benefit)
$
(108
)
 
$
(168
)
 
$
—

 
$
(6
)
 
$
(324
)
 
$
(481
)
 
$
1

 
$
(18
)
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
2019
 
2018
 
2019
 
2018
Defined benefit pension plans
$
18

 
$
273

 
$
64

 
$
318

OPB plans
10

 
10

 
34

 
32

Defined contribution plans
98

 
104

 
377

 
296