Fair Value (Fair Value of Nuclear Decommissioning Trust Fund Assets) (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | $ 2,345 | $ 2,256 |
| DTE Electric | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | 2,345 | 2,256 |
| DTE Electric | Nuclear decommissioning trust fund | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | 2,345 | 2,256 |
| DTE Electric | Nuclear decommissioning trust fund | Fermi 2 | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Nuclear decommissioning trust funds | 2,320 | 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 | $ 22 | $ 19 |