Financial and Other Derivative Instruments (Details Textuals) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 723	$ 707
Letters of credit issued that could be used to offset net derivative liabilities	2	2
Letters of credit received that could be used to offset net derivative assets	16	17
Contractual obligation to post collateral in event of downgrade to below investment grade	459
Derivative net liability position aggregate fair value	667
Collateral already posted fair value	0
Derivative net asset position, fair value	492
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions	175
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	715	704
Other current assets | Derivative assets — FTRs | Derivatives not designated as hedging instruments | DTE Electric
Derivatives, Fair Value [Line Items]
Total derivative assets, gross	$ 4	$ 11