Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	$ 35	$ 22	$ 70	$ 46
Contract services	12	11	29	20
Investment income	9	7	10	8
Equity earnings of equity method investees	4	4	7	11
Other	6	5	9	8
Total other income	66	49	125	93
DTE Electric
Schedule of Other Nonoperating Income, by Component [Line Items]
Allowance for equity funds used during construction	34	22	68	46
Contract services	13	11	29	20
Investment income	8	6	9	7
Other	4	3	7	5
Total other income	$ 59	$ 42	$ 113	$ 78

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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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