Employee Benefit Plans

6 Months Ended

Jun. 30, 2025

Retirement Benefits [Abstract]

Employee Benefit Plans

9. EMPLOYEE BENEFIT PLANS

In DESC’s Consolidated Statements of Comprehensive Income, the service cost component of net periodic benefit (credit) cost is reflected in other operations and maintenance expense with the non-service cost components reflected in other income (expense). Components of net periodic benefit cost (credit) recorded by DESC were as follows:

(millions)	Pension Benefits						Other Postretirement Benefits
Three Months Ended June 30,	2025			2024			2025			2024
Service cost	$	2		$	2		$	—		$	1
Interest cost		8			8			2			2
Expected return on assets		(11	)		(10	)		—			—
Amortization of actuarial losses		2			2			(1	)		(1	)
Net periodic benefit cost	$	1		$	2		$	1		$	2
Six Months Ended June 30,
Service cost	$	4		$	4		$	—		$	1
Interest cost		17			16			4			4
Expected return on assets		(21	)		(19	)		—			—
Amortization of actuarial losses		3			4			(2	)		(2	)
Net periodic benefit cost	$	3		$	5		$	2		$	3

DESC made $1 million of contributions to its qualified pension plan during both the three and six months ended June 30, 2025 and 2024. DESC expects to make $3 million of minimum required contributions to its qualified defined benefit pension plans in 2025 and expects to receive reimbursement for such contributions from Santee Cooper. DESC recovers current pension costs through either a rate rider that may be adjusted annually for retail electric operations or through cost of service rates for gas operations.