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Nuclear Operations (Details) - DTE Electric $ in Millions |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 16, 2014 kWh | May 15, 2014 $ / MWh | Dec. 31, 2024 USD ($)
Entity Information [Line Items] |  |  |
Policy waiting period |  |  | 84 days
Insurance coverage for extra expense when power plant unavailable |  |  | $ 490
Period of coverage of policy for extra expenses |  |  | 3 years
Primary coverage for stabilization, decontamination, debris removal, repair and/or replacement of property, and decommissioning |  |  | $ 1,500
Excess coverage for stabilization, decontamination, debris removal, repair and/or replacement of property, and decommissioning |  |  | 1,250
Combined coverage limit for total property damage |  |  | 2,750
Total limit for property damage for non-nuclear events |  |  | 1,800
Limit of coverage for aggregate extra expenses for non-nuclear events |  |  | $ 291
Period of coverage for extra expenses |  |  | 2 years
Time period for TRIA after the first loss from terrorism |  |  | 1 year
NEIL policies against terrorism loss, amount made available to all insured entities (up to) |  |  | $ 3,200
Maximum assessment if loss amount exceeds funds available |  |  | 40
Public liability insurance for a nuclear incident |  |  | 500
Maximum deferred premium charges that could be levied against each licensed nuclear facility |  |  | 166
Limit of deferred premium charges per year per facility |  |  | $ 25
Company obligated to pay DOE fee of Fermi 2 electricity generated and sold (in dollars per MWh) | $ / MWh |  | 1 |
New DOE fee for Fermi 2 electricity generated and sold (KWh) | kWh | 0 |  |

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