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

 
$
100

 
$
4

 
$
5

$
184

 
$
199

 
$
8

 
$
10

Interest cost
340

 
300

 
20

 
19

680

 
590

 
40

 
38

Expected return on plan assets
(526
)
 
(544
)
 
(23
)
 
(24
)
(1,051
)
 
(1,073
)
 
(46
)
 
(49
)
Amortization of prior service credit
(14
)
 
(14
)
 
—

 
(6
)
(29
)
 
(29
)
 
(1
)
 
(11
)
Net periodic benefit cost (benefit)
$
(108
)
 
$
(158
)
 
$
1

 
$
(6
)
$
(216
)
 
$
(313
)
 
$
1

 
$
(12
)
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
2019
 
2018
 
2019
 
2018
Defined benefit pension plans
$
23

 
$
23

 
$
46

 
$
45

OPB plans
12

 
11

 
24

 
22

Defined contribution plans
88

 
88

 
279

 
192