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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, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 1,825 | $ 2,071
Unrealized Gains | 406 | 628
Unrealized Losses | (102) | (25)
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 42 | 39
Private Equity and Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 262 | 205
Unrealized Gains | 63 | 58
Unrealized Losses | (5) | (8)
Hedge Funds and Similar Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 119 | 76
Unrealized Gains | 0 | 1
Unrealized Losses | (18) | (2)
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 839 | 1,107
Unrealized Gains | 342 | 546
Unrealized Losses | (23) | (9)
Fixed Income Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 563 | 644
Unrealized Gains | 1 | 23
Unrealized Losses | $ (56) | $ (6)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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