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Long-Term Debt (Debt Issuances) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Nov. 30, 2024 | Oct. 31, 2024 | Aug. 31, 2024 | May 31, 2024 | Feb. 29, 2024
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Amount | $ 4,570 |  |  |  |  |
Senior Notes | February 2024 5.10% Senior Notes Maturing In 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 5.10%
Amount |  |  |  |  |  | $ 1,200
Senior Notes | May 2024 5.85% Senior Notes Maturing In 2034 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.85% |
Amount |  |  |  |  | $ 850 |
Senior Notes | August 2024 4.95% Senior Notes Maturing in 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  |  | 4.95% |  |
Amount |  |  |  | $ 1,200 |  |
Senior Notes | Series C 2.53% Senior Notes Due October 1, 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate | 2.53% |  |  |  |  |
Amount | $ 675 |  |  |  |  |
Senior Notes | Series F 4.22% Senior Notes Due November 1, 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate | 4.22% | 4.22% |  |  |  |
Amount | $ 1,300 |  |  |  |  |
DTE Electric | Mortgage Bonds | February 2024 4.85% Mortgage Bonds Maturing In 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 4.85%
Amount |  |  |  |  |  | $ 500
DTE Electric | Mortgage Bonds | February 2024 5.20% Mortgage Bonds Maturing In 2034 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 5.20%
Amount |  |  |  |  |  | $ 500
DTE Gas | Mortgage Bonds | October 2024 4.87% First Mortgage Bonds Maturing In 2034 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  | 4.87% |  |  |
Amount |  |  | $ 160 |  |  |
DTE Gas | Mortgage Bonds | October 2024 5.43% First Mortgage Bonds Maturing In 2054 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  |  | 5.43% |  |  |
Amount |  |  | $ 160 |  |  |

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