Retirement Benefits and Trusteed Assets (Tables)

3 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Costs (Credits)

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

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended March 31,
	2023		2022		2023		2022
	(In millions)
Service cost	$	14	$	24	$	4	$	7
Interest cost	54		41		16		12
Expected return on plan assets	(88)		(87)		(28)		(32)
Amortization of:
Net actuarial loss	2		29		3		1
Prior service credit	(1)		—		(4)		(5)
Settlements	2		—		—		—
Net periodic benefit cost (credit)	$	(17)	$	7	$	(9)	$	(17)

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

	Three Months Ended March 31,
	2023		2022
	(In millions)
Service cost	$	3	$	5
Interest cost	12		9
Expected return on plan assets	(18)		(21)
Amortization of:
Net actuarial loss	—		1
Prior service credit	(3)		(3)
Net periodic benefit credit	$	(6)	$	(9)