Retirement Benefits and Trusteed Assets (OPEB - Reconciliation of Obligations, Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in Regulatory assets (liabilities)
Regulatory liability	$ (3,037)	$ (2,674)
Regulatory assets	6,821	6,317
Other postretirement benefit plan
Change in accumulated postretirement benefit obligation
Projected/Accumulated postretirement benefit obligation, beginning of year	1,283	1,293
Service cost	18	17	$ 27
Interest cost	62	65	48
Actuarial (gain) loss	(165)	(5)
Benefits paid	(75)	(87)
Projected/Accumulated postretirement benefit obligation, end of year	1,123	1,283	1,293
Change in plan assets
Plan assets at fair value, beginning of year	1,614	1,577
Actual return on plan assets	58	124
Benefits paid	(78)	(87)
Plan assets at fair value, end of year	1,594	1,614	1,577
Funded status	471	331
Amount recorded as:
Noncurrent assets	705	633
Current liabilities	(1)	(1)
Noncurrent liabilities	(233)	(301)
Defined benefit plans assets (liabilities)	471	331
Amounts recognized in Accumulated other comprehensive income, pre-tax
Net actuarial gain	(14)	(13)
Amounts recognized in Regulatory assets (liabilities)
Net actuarial (gain) loss	65	173
Prior service credit	0	(10)
Regulatory assets	65	163
DTE Electric
Amounts recognized in Regulatory assets (liabilities)
Regulatory liability	(1,909)	(1,759)
Regulatory assets	6,226	5,695
DTE Electric | Other postretirement benefit plan
Change in accumulated postretirement benefit obligation
Projected/Accumulated postretirement benefit obligation, beginning of year	982	982
Service cost	14	13	20
Interest cost	47	49	37
Actuarial (gain) loss	(139)	2
Benefits paid	(55)	(64)
Projected/Accumulated postretirement benefit obligation, end of year	849	982	982
Change in plan assets
Plan assets at fair value, beginning of year	1,070	1,052
Actual return on plan assets	40	81
Benefits paid	(58)	(63)
Plan assets at fair value, end of year	1,052	1,070	$ 1,052
Funded status	203	88
Amount recorded as:
Noncurrent assets	428	378
Current liabilities	0	0
Noncurrent liabilities	(225)	(290)
Defined benefit plans assets (liabilities)	203	88
Amounts recognized in Accumulated other comprehensive income, pre-tax
Net actuarial gain	0	0
Amounts recognized in Regulatory assets (liabilities)
Net actuarial (gain) loss	(26)	73
Prior service credit	0	(6)
Regulatory liability	$ (26)
Regulatory assets		$ 67