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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost

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

(millions)

 

Pension Benefits

 

 

Other Postretirement Benefits

 

Three Months Ended March 31,

 

2021

 

 

2020

 

 

2021

 

 

2020

 

Service cost

 

$

3

 

 

$

3

 

 

$

1

 

 

$

1

 

Interest cost

 

 

5

 

 

 

6

 

 

 

1

 

 

 

2

 

Expected return on assets

 

 

(12

)

 

 

(11

)

 

 

—

 

 

 

—

 

Amortization of actuarial losses

 

 

2

 

 

 

2

 

 

 

—

 

 

 

—

 

Net periodic benefit cost (credit)

 

$

(2

)

 

$

—

 

 

$

2

 

 

$

3