Significant Accounting Policies (Income Taxes) (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	4.40%	11.00%	4.40%	4.60%
Production tax credits	(4.40%)	(67.30%)	(5.60%)	(9.60%)
TCJA amortization	(3.10%)	(110.40%)	(3.80%)	(15.80%)
Investment tax credits	(1.40%)	(1.60%)	(2.00%)	(0.20%)
Enactment of West Virginia income tax legislation, net of federal benefit	0.00%	0.00%	(0.80%)	0.00%
State tax audit settlement, net of federal benefit	(1.80%)	0.00%	(0.60%)	0.00%
Other	(0.30%)	0.80%	(1.10%)	(1.50%)
Effective Tax Rate	14.40%	(146.50%)	11.50%	(1.50%)
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	5.70%	5.80%	5.70%	5.80%
Production tax credits	(8.20%)	(9.00%)	(7.80%)	(9.00%)
TCJA amortization	(5.30%)	(15.40%)	(5.00%)	(15.50%)
State tax audit settlement, net of federal benefit	(2.10%)	0.00%	(1.30%)	0.00%
Other	(1.40%)	(0.90%)	(1.20%)	(0.80%)
Effective Tax Rate	9.70%	1.50%	11.40%	1.50%

Effective Income Tax Rate Reconciliation, Change in Tax Legislation, Percent

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Effective Income Tax Rate Reconciliation, Increase (Decrease), Percent

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amortization of Regulatory Liability, Percent

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[Line Items] for Schedule of Income Taxes [Table]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax settlement.

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