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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%

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