Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Costs (Credits)

The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:

	Pension Benefits				Other Postretirement Benefits
	2023		2022		2023		2022
	(In millions)
Three Months Ended September 30,
Service cost	$	15	$	25	$	4	$	6
Interest cost	54		41		17		12
Expected return on plan assets	(89)		(87)		(28)		(32)
Amortization of:
Net actuarial loss	2		29		2		1
Prior service credit	(1)		—		(4)		(4)
Net periodic benefit cost (credit)	$	(19)	$	8	$	(9)	$	(17)

	Pension Benefits				Other Postretirement Benefits
	2023		2022		2023		2022
	(In millions)
Nine Months Ended September 30,
Service cost	$	43	$	72	$	13	$	20
Interest cost	161		124		49		36
Expected return on plan assets	(264)		(260)		(83)		(95)
Amortization of:
Net actuarial loss	5		86		7		3
Prior service credit	(2)		—		(14)		(14)
Settlements	7		—		—		—
Net periodic benefit cost (credit)	$	(50)	$	22	$	(28)	$	(50)

The following table details the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
	(In millions)
Service cost	$	3	$	5	$	10	$	15
Interest cost	12		10		37		28
Expected return on plan assets	(18)		(22)		(55)		(64)
Amortization of:
Net actuarial loss	—		2		—		4
Prior service credit	(3)		(4)		(10)		(10)
Net periodic benefit credit	$	(6)	$	(9)	$	(18)	$	(27)