Fair Value (Fair Value and Unrealized Gains and Losses for Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 2,345	$ 2,256
Unrealized Gains	752	687
Unrealized Losses	(54)	(58)
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	25	26
Unrealized Gains	0	0
Unrealized Losses	0	0
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	346	349
Unrealized Gains	106	106
Unrealized Losses	(8)	(8)
Hedge funds and similar investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	235	228
Unrealized Gains	5	7
Unrealized Losses	(6)	(5)
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,080	1,003
Unrealized Gains	628	558
Unrealized Losses	(15)	(16)
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	659	650
Unrealized Gains	13	16
Unrealized Losses	$ (25)	$ (29)

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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