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Significant Accounting Policies (Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 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% | 3.90% | 4.20% | 4.00%
Investment tax credits | (13.70%) | (2.70%) | (13.20%) | (2.90%)
Production tax credits | (10.20%) | (7.10%) | (10.40%) | (7.70%)
TCJA regulatory liability amortization | (4.80%) | (4.20%) | (4.60%) | (4.50%)
AFUDC equity | (2.00%) | (1.00%) | (1.60%) | (1.10%)
Enactment of Illinois income tax legislation, net of federal benefit | 5.90% | 0.00% | 2.10% | 0.00%
Other | 0.00% | 0.20% | (0.10%) | (0.60%)
Effective Tax Rate | 0.40% | 10.10% | (2.60%) | 8.20%
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% | 5.30% | 5.60% | 5.30%
Investment tax credits | (16.30%) | (0.20%) | (16.20%) | (0.20%)
Production tax credits | (6.60%) | (8.40%) | (6.80%) | (8.90%)
TCJA regulatory liability amortization | (4.70%) | (4.40%) | (4.60%) | (4.60%)
AFUDC equity | (2.10%) | (1.20%) | (2.00%) | (1.30%)
Other | (0.30%) | (0.20%) | (0.30%) | (0.30%)
Effective Tax Rate | (3.40%) | 11.90% | (3.30%) | 11.00%

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- Definition [Line Items] for Schedule of Income Taxes [Table] + References No definition available. + Details
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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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