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Related Party Transactions - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 01, 2021
Jun. 30, 2021
Jan. 31, 2021
Dec. 31, 2021
Common Stock        
Related Party Transaction [Line Items]        
Issuance of common shares (in shares)     1,000 1,000 [1]
Related Party        
Related Party Transaction [Line Items]        
Related party interest rate       3.30%
Term of related party agreement       1 year
Repayment of term loan   $ 2,537    
Net cash payment for accounts receivable due from and accounts payable due to DTE Energy   $ 9    
Related Party | Common Stock        
Related Party Transaction [Line Items]        
Issuance of common shares (in shares) 96,732,466     96,731,000 [2]
[1] Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC.
[2] Issuance of common shares to DTE Energy in anticipation of the Separation.