Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
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	4.80%	4.40%	4.50%	4.50%
Production tax credits	(7.80%)	(9.10%)	(6.40%)	(9.40%)
TCJA amortization	(4.90%)	(13.60%)	(4.20%)	(14.80%)
Investment tax credits	(3.80%)	0.00%	(2.60%)	(0.10%)
Enactment of West Virginia income tax legislation, net of federal benefit	0.00%	0.00%	(0.60%)	0.00%
Other	(3.00%)	(1.20%)	(1.90%)	(1.20%)
Effective Tax Rate	6.30%	1.50%	9.80%	0.00%
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	5.70%	5.70%	5.70%	5.70%
Production tax credits	(11.10%)	(9.50%)	(9.40%)	(9.20%)
TCJA amortization	(6.90%)	(14.60%)	(5.90%)	(15.00%)
Other	(1.90%)	(0.90%)	(2.20%)	(0.90%)
Effective Tax Rate	6.80%	1.70%	9.20%	1.60%