Retirement Benefits and Trusteed Assets (Tables)

6 Months Ended

Jun. 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
	Three Months Ended June 30,
	2023		2022		2023		2022
	(In millions)
Service cost	$	14	$	23	$	5	$	7
Interest cost	53		42		16		12
Expected return on plan assets	(87)		(86)		(27)		(31)
Amortization of:
Net actuarial loss	1		28		2		1
Prior service credit	—		—		(6)		(5)
Settlements	5		—		—		—
Net periodic benefit cost (credit)	$	(14)	$	7	$	(10)	$	(16)

	Pension Benefits				Other Postretirement Benefits
	Six Months Ended June 30,
	2023		2022		2023		2022
	(In millions)
Service cost	$	28	$	47	$	9	$	14
Interest cost	107		83		32		24
Expected return on plan assets	(175)		(173)		(55)		(63)
Amortization of:
Net actuarial loss	3		57		5		2
Prior service credit	(1)		—		(10)		(10)
Settlements	7		—		—		—
Net periodic benefit cost (credit)	$	(31)	$	14	$	(19)	$	(33)

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
	(In millions)
Service cost	$	4	$	5	$	7	$	10
Interest cost	13		9		25		18
Expected return on plan assets	(19)		(21)		(37)		(42)
Amortization of:
Net actuarial loss	—		1		—		2
Prior service credit	(4)		(3)		(7)		(6)
Net periodic benefit credit	$	(6)	$	(9)	$	(12)	$	(18)