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Retirement Benefits (Unaudited)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
RETIREMENT BENEFITS RETIREMENT BENEFITS
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
The company sponsors defined benefit pension and OPB plans, as well as defined contribution plans. We fund our defined benefit pension plans annually in a manner consistent with the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006.
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