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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2022
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Credit)

Components of net periodic benefit cost (credit) recorded by DESC were as follows:

(millions)

 

Pension Benefits

 

 

Other Postretirement Benefits

 

Three Months Ended September 30,

 

2022

 

 

2021

 

 

2022

 

 

2021

 

Service cost

 

$

2

 

 

$

3

 

 

$

—

 

 

$

—

 

Interest cost

 

 

5

 

 

 

5

 

 

 

1

 

 

 

1

 

Expected return on assets

 

 

(12

)

 

 

(12

)

 

 

—

 

 

 

—

 

Amortization of actuarial losses

 

 

1

 

 

 

1

 

 

 

—

 

 

 

—

 

Net periodic benefit cost (credit)

 

$

(4

)

 

$

(3

)

 

$

1

 

 

$

1

 

Nine Months Ended September 30,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

6

 

 

$

7

 

 

$

1

 

 

$

1

 

Interest cost

 

 

16

 

 

 

15

 

 

 

4

 

 

 

4

 

Expected return on assets

 

 

(37

)

 

 

(36

)

 

 

—

 

 

 

—

 

Amortization of actuarial losses

 

 

1

 

 

 

4

 

 

 

—

 

 

 

—

 

Net periodic benefit cost (credit)

 

$

(14

)

 

$

(10

)

 

$

5

 

 

$

5