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Long-Term Debt (Debt Redemptions) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2022 | Dec. 31, 2022 | Nov. 30, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Amount | $ 1,250 |  |  |  |  | $ 1,587 | $ 3,522 | $ 882
Senior Notes | 2.25% Senior Notes |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  | 2.25% |  |  |  |  |
Amount |  |  | $ 500 |  |  |  |  |
Senior Notes | 0.55% Senior Notes |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  | 0.55% |  |  |  |  |
Amount |  |  | $ 750 |  |  |  |  |
Securitization Bonds | 2.64% Securitization Bonds |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  | 2.64% |  |  |  | 2.64% |  |
Amount |  | $ 21 |  |  |  |  |  |
DTE Electric |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Amount |  |  |  |  |  | $ 337 | $ 321 | $ 632
DTE Electric | Mortgage Bonds | 2.65% Mortgage Bonds |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.65% |  |  |
Amount |  |  |  |  | $ 250 |  |  |
DTE Electric | Mortgage Bonds | 6.95% Mortgage Bonds |  |  |  |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 6.95% |  |  |  |
Amount |  |  |  | $ 66 |  |  |  |

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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