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)

Decommissioning Fund Investments, Accumulated Gross Unrealized Gain, Before Tax

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- Definition

Decommissioning Fund Investments, Accumulated Gross Unrealized Loss, Before Tax

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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