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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 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 2,041 | $ 1,825
Unrealized Gains | 545 | 406
Unrealized Losses | (58) | (102)
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 34 | 42
Private Equity and Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 312 | 262
Unrealized Gains | 74 | 63
Unrealized Losses | (8) | (5)
Hedge Funds and Similar Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 184 | 119
Unrealized Gains | 4 | 0
Unrealized Losses | (9) | (18)
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 921 | 839
Unrealized Gains | 459 | 342
Unrealized Losses | (11) | (23)
Fixed Income Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 590 | 563
Unrealized Gains | 8 | 1
Unrealized Losses | $ (30) | $ (56)

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- Definition Decommissioning Fund Investments, Accumulated Gross Unrealized Gain, Before Tax + References No definition available. + Details
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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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