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Financial and Other Derivative Instruments (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 609	$ 694
Letters of credit issued that could be used to offset net derivative liabilities	1	1
Letters of credit received that could be used to offset net derivative assets	9	0
Contractual obligation to post collateral in event of downgrade to below investment grade	342
Derivative net liability position aggregate fair value	416
Collateral already posted fair value	0
Derivative net asset position, fair value	380
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions	36
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	609	674
Other current assets | Derivative assets — FTRs | Derivatives not designated as hedging instruments | DTE Electric
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 18	$ 9

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The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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