Retirement Benefits and Trusteed Assets (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31,
	2021		2020		2021		2020
	(In millions)
Service cost	$	27	$	25	$	8	$	6
Interest cost	39		46		11		14
Expected return on plan assets	(84)		(83)		(32)		(32)
Amortization of:
Net actuarial loss	49		43		3		5
Prior service credit	—		—		(5)		(5)
Net periodic benefit cost (credit)	$	31	$	31	$	(15)	$	(12)

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

	Three Months Ended March 31,
	2021		2020
	(In millions)
Service cost	$	6	$	5
Interest cost	8		11
Expected return on plan assets	(22)		(22)
Amortization of:
Net actuarial loss	3		3
Prior service credit	(3)		(4)
Net periodic benefit credit	$	(8)	$	(7)