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Fair Value (Fair Value of Nuclear Decommissioning Trust Fund Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Nuclear decommissioning trust funds | $ 2,480 | $ 2,256
DTE Electric |  |
Debt Securities, Available-for-sale [Line Items] |  |
Nuclear decommissioning trust funds | 2,480 | 2,256
DTE Electric | Nuclear decommissioning trust fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Nuclear decommissioning trust funds | 2,480 | 2,256
DTE Electric | Nuclear decommissioning trust fund | Fermi 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Nuclear decommissioning trust funds | 2,453 | 2,234
DTE Electric | Nuclear decommissioning trust fund | Fermi 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Nuclear decommissioning trust funds | 3 | 3
DTE Electric | Nuclear decommissioning trust fund | Low-level radioactive waste |  |
Debt Securities, Available-for-sale [Line Items] |  |
Nuclear decommissioning trust funds | $ 24 | $ 19

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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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