Retirement Benefits and Trusteed Assets (Tables)

6 Months Ended

Jun. 30, 2022

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,
	2022		2021		2022		2021
	(In millions)
Service cost	$	23	$	27	$	7	$	7
Interest cost	42		40		12		12
Expected return on plan assets	(86)		(86)		(31)		(32)
Amortization of:
Net actuarial loss	28		49		1		4
Prior service credit	—		—		(5)		(5)
Net periodic benefit cost (credit)	$	7	$	30	$	(16)	$	(14)

	Pension Benefits				Other Postretirement Benefits
	Six Months Ended June 30,
	2022		2021		2022		2021
	(In millions)
Service cost	$	47	$	54	$	14	$	15
Interest cost	83		79		24		23
Expected return on plan assets	(173)		(170)		(63)		(64)
Amortization of:
Net actuarial loss	57		98		2		7
Prior service credit	—		—		(10)		(10)
Net periodic benefit cost (credit)	$	14	$	61	$	(33)	$	(29)

The following tables detail 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,
	2022		2021		2022		2021
	(In millions)
Service cost	$	5	$	5	$	10	$	11
Interest cost	9		9		18		17
Expected return on plan assets	(21)		(21)		(42)		(43)
Amortization of:
Net actuarial loss	1		3		2		6
Prior service credit	(3)		(4)		(6)		(7)
Net periodic benefit credit	$	(9)	$	(8)	$	(18)	$	(16)