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Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,913 | $ 1,825
Unrealized Gains | 467 | 406
Unrealized Losses | (93) | (102)
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 39 | 42
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Private equity and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 308 | 262
Unrealized Gains | 76 | 63
Unrealized Losses | (7) | (5)
Hedge funds and similar investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 172 | 119
Unrealized Gains | 3 | 0
Unrealized Losses | (14) | (18)
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 852 | 839
Unrealized Gains | 388 | 342
Unrealized Losses | (19) | (23)
Fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 542 | 563
Unrealized Gains | 0 | 1
Unrealized Losses | $ (53) | $ (56)

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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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