Fair Value (Fair Value of Nuclear Decommissioning Trust Fund Assets) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | $ 2,756 | $ 2,552 |
| DTE Electric | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | 2,756 | 2,552 |
| DTE Electric | Nuclear decommissioning trust fund | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | 2,756 | 2,552 |
| DTE Electric | Nuclear decommissioning trust fund | Fermi 2 | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | 2,724 | 2,523 |
| 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 | $ 29 | $ 26 |
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|