Fair Value (Fair Value and Unrealized Gains and Losses for Nuclear Decommissioning Trust Funds) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 33	$ 35
Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	378	358
Hedge funds and similar investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	255	245
Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,284	1,188
Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	806	726
DTE Electric
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,756	2,552
Unrealized Gains	1,020	900
Unrealized Losses	(42)	(40)
DTE Electric \| Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	33	35
Unrealized Gains	0	0
Unrealized Losses	0	0
DTE Electric \| Private equity and other
Debt Securities, Available-for-sale [Line Items]
Fair Value	378	358
Unrealized Gains	129	125
Unrealized Losses	(9)	(7)
DTE Electric \| Hedge funds and similar investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	255	245
Unrealized Gains	10	8
Unrealized Losses	(8)	(6)
DTE Electric \| Equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,284	1,188
Unrealized Gains	854	742
Unrealized Losses	(7)	(10)
DTE Electric \| Fixed income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	806	726
Unrealized Gains	27	25
Unrealized Losses	$ (18)	$ (17)

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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