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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

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 September 30,		2020				2019				2020				2019
Service cost		$	3			$	4			$	1			$	1
Interest cost			6				6				2				2
Expected return on assets			(11	)			(11	)			—				—
Amortization of actuarial losses			2				2				—				—
Settlement loss⁽¹⁾			—				11				—				—
Net periodic benefit cost		$	—			$	12			$	3			$	3
Nine Months Ended September 30,
Service cost		$	10			$	11			$	3			$	2
Interest cost			18				21				6				6
Expected return on assets			(33	)			(31	)			—				—
Amortization of actuarial losses			5				9				—				—
Curtailment⁽¹⁾			—				6				—				3
Settlement loss⁽¹⁾			—				11				—				—
Net periodic benefit cost		$	—			$	27			$	9			$	11

(1)	Related to a voluntary retirement program.