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Fair Value (Fair Value and Unrealized Gains and Losses for Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 2,480 | $ 2,256
Unrealized Gains | 840 | 687
Unrealized Losses | (41) | (58)
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 31 | 26
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Private equity and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 362 | 349
Unrealized Gains | 122 | 106
Unrealized Losses | (9) | (8)
Hedge funds and similar investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 241 | 228
Unrealized Gains | 6 | 7
Unrealized Losses | (5) | (5)
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 1,139 | 1,003
Unrealized Gains | 694 | 558
Unrealized Losses | (9) | (16)
Fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 707 | 650
Unrealized Gains | 18 | 16
Unrealized Losses | $ (18) | $ (29)

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- Definition Decommissioning Fund Investments, Accumulated Gross Unrealized Loss, Before Tax + References No definition available. + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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