Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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	4.10%	4.40%
Production tax credits	(8.70%)	(6.20%)
TCJA regulatory liability amortization	(4.90%)	(4.10%)
Investment tax credits	(3.10%)	(2.30%)
AFUDC equity	(1.20%)	(0.30%)
Enactment of West Virginia income tax legislation, net of federal benefit	0.00%	(1.20%)
Other	(1.00%)	(1.20%)
Effective Tax Rate	6.20%	10.10%
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	5.30%	5.60%
Production tax credits	(10.20%)	(7.10%)
TCJA regulatory liability amortization	(5.10%)	(4.50%)
AFUDC equity	(1.50%)	(0.30%)
Other	0.10%	(0.50%)
Effective Tax Rate	9.60%	14.20%