Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Schedule of Income Taxes [Line Items]
Statutory federal income tax rate	21.00%	21.00%
Increase (decrease) due to:
State and local income taxes, net of federal benefit	4.20%	4.10%
Investment tax credits	(13.10%)	(3.10%)
Production tax credits	(10.50%)	(8.30%)
TCJA regulatory liability amortization	(4.50%)	(4.90%)
AFUDC equity	(1.50%)	(1.20%)
Other	0.20%	(1.40%)
Effective Tax Rate	(4.20%)	6.20%
DTE Electric
Schedule of Income Taxes [Line Items]
Statutory federal income tax rate	21.00%	21.00%
Increase (decrease) due to:
State and local income taxes, net of federal benefit	5.70%	5.30%
Investment tax credits	(16.60%)	(0.20%)
Production tax credits	(7.00%)	(9.70%)
TCJA regulatory liability amortization	(4.60%)	(5.10%)
AFUDC equity	(1.80%)	(1.50%)
Other	0.40%	(0.20%)
Effective Tax Rate	(2.90%)	9.60%