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Organization and Basis of Presentation (Details Textuals)
customer in Millions, $ in Millions
Dec. 31, 2021
USD ($)
customer
Dec. 31, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of electric utility customers | customer 2.3  
Number of gas utility customers | customer 1.3  
Variable Interest Entity [Line Items]    
Material potential exposure $ 0  
Investments in equity method investees 187 $ 177
Amount in excess of carrying amount 99 93
Undistributed earnings from equity method investees 32 $ 15
DTE Electric    
Variable Interest Entity [Line Items]    
Material potential exposure $ 0