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Significant Accounting Policies (Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
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 | 4.20% | 5.00% | 4.20% | 4.30%
Investment tax credits | (13.20%) | (34.20%) | (13.50%) | (13.60%)
Production tax credits | (10.80%) | (17.20%) | (10.60%) | (10.90%)
TCJA regulatory liability amortization | (4.70%) | (6.20%) | (4.60%) | (5.10%)
AFUDC equity | (1.40%) | (1.60%) | (1.50%) | (1.30%)
Enactment of Illinois income tax legislation, net of federal benefit | 0.00% | 0.00% | 1.30% | 0.00%
Valuation allowance due to enactment of federal income tax legislation | 4.00% | 0.00% | 1.60% | 0.00%
Other | (0.40%) | (0.60%) | 0.00% | (0.50%)
Effective Tax Rate | (1.30%) | (33.80%) | (2.10%) | (6.10%)
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 | 5.60% | 6.20% | 5.60% | 5.70%
Investment tax credits | (15.60%) | (28.70%) | (15.90%) | (11.70%)
Production tax credits | (6.60%) | (19.30%) | (6.70%) | (13.10%)
TCJA regulatory liability amortization | (4.60%) | (6.40%) | (4.60%) | (5.30%)
AFUDC equity | (1.80%) | (1.90%) | (1.90%) | (1.60%)
Other | (0.80%) | (0.50%) | (0.50%) | (0.30%)
Effective Tax Rate | (2.80%) | (29.60%) | (3.00%) | (5.30%)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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