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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The cost to the company of its retirement plans is shown in the following table:
 
Three Months Ended March 31
 
Pension
Benefits
 
OPB
$ in millions
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost
 
 
 
 
 
 
 
Service cost
$
92

 
$
99

 
$
4

 
$
5

Interest cost
340

 
290

 
20

 
19

Expected return on plan assets
(525
)
 
(529
)
 
(23
)
 
(25
)
Amortization of prior service credit
(15
)
 
(15
)
 
(1
)
 
(5
)
Net periodic benefit cost (benefit)
$
(108
)
 
$
(155
)
 
$
—

 
$
(6
)
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 
Three Months Ended March 31
$ in millions
2019
 
2018
Defined benefit pension plans
$
23

 
$
22

OPB plans
12

 
11

Defined contribution plans
191

 
104