Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 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	3.90%	4.40%	4.00%	4.40%
Production tax credits	(7.70%)	(4.40%)	(8.20%)	(5.60%)
TCJA regulatory liability amortization	(4.20%)	(3.10%)	(4.50%)	(3.80%)
Investment tax credits	(2.70%)	(1.40%)	(2.90%)	(2.00%)
State tax audit settlement, net of federal benefit	0.00%	(1.80%)	0.00%	(0.60%)
Other	(0.20%)	(0.30%)	(1.20%)	(1.90%)
Effective Tax Rate	10.10%	14.40%	8.20%	11.50%
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	5.30%	5.70%	5.30%	5.70%
Production tax credits	(9.20%)	(8.20%)	(9.60%)	(7.80%)
TCJA regulatory liability amortization	(4.40%)	(5.30%)	(4.60%)	(5.00%)
AFUDC equity	(1.20%)	(0.50%)	(1.30%)	(0.40%)
State tax audit settlement, net of federal benefit	0.00%	(2.10%)	0.00%	(1.30%)
Other	0.40%	(0.90%)	0.20%	(0.80%)
Effective Tax Rate	11.90%	9.70%	11.00%	11.40%