Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 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 September 30,
	2022		2021		2022		2021
	(In millions)
Service cost	$	25	$	27	$	6	$	8
Interest cost	41		39		12		12
Expected return on plan assets	(87)		(84)		(32)		(33)
Amortization of:
Net actuarial loss	29		49		1		3
Prior service credit	—		—		(4)		(5)
Net periodic benefit cost (credit)	$	8	$	31	$	(17)	$	(15)

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended September 30,
	2022		2021		2022		2021
	(In millions)
Service cost	$	72	$	81	$	20	$	23
Interest cost	124		118		36		35
Expected return on plan assets	(260)		(254)		(95)		(97)
Amortization of:
Net actuarial loss	86		147		3		10
Prior service credit	—		—		(14)		(15)
Net periodic benefit cost (credit)	$	22	$	92	$	(50)	$	(44)

The following tables detail 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,
	2022		2021		2022		2021
	(In millions)
Service cost	$	5	$	6	$	15	$	17
Interest cost	10		8		28		25
Expected return on plan assets	(22)		(22)		(64)		(65)
Amortization of:
Net actuarial loss	2		3		4		9
Prior service credit	(4)		(3)		(10)		(10)
Net periodic benefit credit	$	(9)	$	(8)	$	(27)	$	(24)