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Long-Term Debt (Debt Redemptions) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Debt Instrument, Redemption [Line Items] |  |
Amount | $ 1,200 | $ 143
Senior Notes | Senior Notes 1.05% Due 2025 |  |
Debt Instrument, Redemption [Line Items] |  |
Interest Rate | 1.05% |
Amount | $ 800 |
DTE Electric |  |
Debt Instrument, Redemption [Line Items] |  |
Amount | $ 400 | $ 143
DTE Electric | Mortgage Bonds | Mortgage Bonds 3.38% Due 2025 |  |
Debt Instrument, Redemption [Line Items] |  |
Interest Rate | 3.38% |
Amount | $ 350 |
DTE Electric | Securitization Bonds | Securitization Bonds 5.97% Due 2025 |  |
Debt Instrument, Redemption [Line Items] |  |
Interest Rate | 5.97% |
Amount | $ 15 |
DTE Electric | Securitization Bonds | Securitization Bonds 2.64% Due 2025 |  |
Debt Instrument, Redemption [Line Items] |  |
Interest Rate | 2.64% |
Amount | $ 20 |

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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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 + Details
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