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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.

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