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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 2,134 | $ 2,041
Unrealized Gains | 621 | 545
Unrealized Losses | (59) | (58)
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 39 | 34
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Private equity and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 328 | 312
Unrealized Gains | 86 | 74
Unrealized Losses | (8) | (8)
Hedge funds and similar investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 192 | 184
Unrealized Gains | 7 | 4
Unrealized Losses | (8) | (9)
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 982 | 921
Unrealized Gains | 517 | 459
Unrealized Losses | (11) | (11)
Fixed income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 593 | 590
Unrealized Gains | 11 | 8
Unrealized Losses | $ (32) | $ (30)

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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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