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Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension cost (credit) |  | $ (19,000,000) | $ 8,000,000 | $ (50,000,000) | $ 22,000,000
Pension plans | Qualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Anticipated contributions, current fiscal year |  | 0 |  | 0 |
Postretirement benefit plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension cost (credit) |  | (9,000,000) | (17,000,000) | (28,000,000) | (50,000,000)
Anticipated contributions, current fiscal year |  | 0 |  | 0 |
DTE Electric | Pension plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension cost (credit) |  | (12,000,000) | 9,000,000 | (28,000,000) | 27,000,000
DTE Electric | Pension plans | Qualified Plan | Maximum | Forecast |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension funds transferred to (from) plan | $ 50,000,000 |  |  |  |
DTE Electric | Postretirement benefit plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension cost (credit) |  | $ (6,000,000) | $ (9,000,000) | $ (18,000,000) | $ (27,000,000)
DTE Gas | Pension plans | Qualified Plan | Maximum | Forecast |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension funds transferred to (from) plan | $ (50,000,000) |  |  |  |

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