Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule of Income Taxes [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Increase (decrease) due to:
State and local income taxes, net of federal benefit	5.00%	4.80%	4.30%	4.50%
Investment tax credits	(34.20%)	(3.80%)	(13.60%)	(2.60%)
Production tax credits	(17.20%)	(7.80%)	(10.90%)	(6.40%)
TCJA regulatory liability amortization	(6.20%)	(4.90%)	(5.10%)	(4.20%)
AFUDC equity	(1.60%)	(0.80%)	(1.30%)	(0.50%)
Other	(0.60%)	(2.20%)	(0.50%)	(2.00%)
Effective Tax Rate	(33.80%)	6.30%	(6.10%)	9.80%
DTE Electric
Schedule of Income Taxes [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Increase (decrease) due to:
State and local income taxes, net of federal benefit	6.20%	5.70%	5.70%	5.70%
Investment tax credits	(28.70%)	(0.30%)	(11.70%)	(0.30%)
Production tax credits	(19.30%)	(11.10%)	(13.10%)	(9.40%)
TCJA regulatory liability amortization	(6.40%)	(6.90%)	(5.30%)	(5.90%)
AFUDC equity	(1.90%)	(1.10%)	(1.60%)	(0.70%)
Other	(0.50%)	(0.50%)	(0.30%)	(1.20%)
Effective Tax Rate	(29.60%)	6.80%	(5.30%)	9.20%