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Financial and Other Derivative Instruments (Details Textuals) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 1,391 $ 567
Letters of credit that could be used to offset net derivative liabilities 18 7
Letters of credit that could be used to offset net derivative assets 37 9
Additional collateral, aggregate fair value 667  
Derivative net liability position aggregate fair value 1,300  
Collateral already posted fair value 8  
Derivative, net asset position, fair value 1,000  
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions 232  
Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative Assets 1,391 567
FTRs | Derivatives not designated as hedging instruments | DTE Electric | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 9 $ 4