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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost (Credit)

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

 

(millions)

 

Pension Benefits

 

 

Other Postretirement Benefits

 

Three Months Ended September 30,

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Service cost

 

$

4

 

 

$

5

 

 

$

1

 

 

$

1

 

Interest cost

 

 

6

 

 

 

7

 

 

 

2

 

 

 

2

 

Expected return on assets

 

 

(11

)

 

 

(12

)

 

 

—

 

 

 

—

 

Amortization of actuarial losses (gains)

 

 

2

 

 

 

3

 

 

 

—

 

 

 

(1

)

Settlement loss(1)

 

 

11

 

 

 

—

 

 

 

—

 

 

 

—

 

Net periodic benefit cost

 

$

12

 

 

$

3

 

 

$

3

 

 

$

2

 

Nine Months Ended September 30,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

11

 

 

$

13

 

 

$

2

 

 

$

3

 

Interest cost

 

 

21

 

 

 

22

 

 

 

6

 

 

 

6

 

Expected return on assets

 

 

(31

)

 

 

(36

)

 

 

—

 

 

 

—

 

Amortization of actuarial losses

 

 

9

 

 

 

8

 

 

 

—

 

 

 

—

 

Curtailment(1)

 

 

6

 

 

 

—

 

 

 

3

 

 

 

—

 

Settlement loss(1)

 

 

11

 

 

 

—

 

 

 

—

 

 

 

—

 

Net periodic benefit cost

 

$

27

 

 

$

7

 

 

$

11

 

 

$

9

 

 

(1) Related to a voluntary retirement program.