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Retirement Benefits (Unaudited)
 9 Months Ended
Sep. 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 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
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 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