Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	$ 22	$ 20	$ 46	$ 38
Contract services	11	6	20	13
Equity earnings of equity method investees	4	32	11	24
Investment income	7	3	8	9
Other	5	4	8	8
Total other income	49	65	93	92
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	22	19	46	37
Contract services	11	7	20	13
Investment income	6	2	7	7
Other	3	4	5	7
Total other income	$ 42	$ 32	$ 78	$ 64

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Income On Contract Services

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Other Miscellaneous Nonoperating Income

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Amount of income related to nonoperating activities, classified as other.

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The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

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