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Long-Term Debt (Debt Redemptions) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  | $ 1,616 | $ 1,587 | $ 3,522
Long-term debt outstanding | $ 19,707 |  |  |  |  |  | $ 19,707 |  |
Unsecured | Term Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Amount |  |  |  | $ 200 | $ 800 |  |  |  |
DTE Gas | Senior Notes | 6.44% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 6.44% |  |  |
Amount |  |  |  |  |  | $ 25 |  |  |
DTE Gas | Mortgage Bonds | 3.64% Mortgage Bonds |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 3.64% |  |  |  |  |  | 3.64% |  |
Amount | $ 50 |  |  |  |  |  |  |  |
DTE Electric |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  | $ 541 | $ 337 | $ 321
Long-term debt outstanding | $ 11,147 |  |  |  |  |  | $ 11,147 |  |
DTE Electric | Senior Notes | 5.19% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  | 5.19% |  |  |  |  |  |  |
Amount |  | $ 100 |  |  |  |  |  |  |
DTE Electric | Securitization Bonds | 2.64% Securitization Bonds |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 2.64% |  |  | 2.64% |  |  | 2.64% |  |
Amount | $ 20 |  |  | $ 19 |  |  |  |  |
DTE Electric | Mortgage Bonds | 4.31% Mortgage Bonds |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  | 4.31% |  |  |  |  |  |
Amount |  |  | $ 102 |  |  |  |  |  |
DTE Electric | Mortgage Bonds | 3.65% Mortgage Bonds |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate | 3.65% |  |  |  |  |  | 3.65% |  |
Amount | $ 300 |  |  |  |  |  |  |  |
Long-term debt outstanding | $ 100 |  |  |  |  |  | $ 100 |  |

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