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Long-Term Debt (Long Term Debt Outstanding and Interest Rates) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, total | $ 18,127 |
Mortgage Bonds, Notes and Other |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 17,002 | $ 16,608
Unamortized debt discount | (26) | (23)
Unamortized debt issuance costs | (92) | (90)
Long-term debt due within one year | (1,077) | (2,866)
Long-term debt (net of current portion) | $ 15,807 | 13,629
Unsecured |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.40% |
Long-term debt, gross | $ 5,105 | 5,555
Securitization Bonds |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | (4) |
Long-term debt due within one year | (39) | 0
Long-term debt (net of current portion) | $ 172 | 0
Junior Subordinated Debentures |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.80% |
Long-term debt, gross | $ 910 | 910
Unamortized debt issuance costs | (27) | (27)
Long-term debt, total | 883 | 883
DTE Electric |  |
Debt Instrument [Line Items] |  |
Long-term debt due within one year | (203) | (316)
Long-term debt, total | 9,787 |
DTE Electric | Mortgage Bonds, Notes and Other |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount | (22) | (19)
Unamortized debt issuance costs | (65) | (62)
Long-term debt (net of current portion) | $ 9,282 | 8,591
DTE Electric | Principally Secured |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.70% |
Long-term debt, gross | $ 9,572 | 8,988
DTE Electric | Securitization Bonds |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.80% |
Long-term debt, gross | $ 215 | 0
Unamortized debt issuance costs | (4) |
Long-term debt due within one year | (39) | 0
Long-term debt (net of current portion) | $ 172 | 0
DTE Gas | Principally Secured |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.00% |
Long-term debt, gross | $ 2,325 | $ 2,065

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