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Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Significant Accounting Policies [Line Items] |  |  |  |  |
Valuation allowance charitable contributions carryforward | $ 16 |  | $ 16 |  |
Unrecognized compensation cost | 78 |  | $ 78 |  |
Recognition period (in years) |  |  | 1 year 10 months 24 days |  |
Specific review of probable future collections based on receivable balances, threshold duration (in days) |  |  | 30 days |  |
Past due |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Financing receivables | 0 |  | $ 0 |  |
Notes receivable |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Financing receivables | $ 1,270 |  | $ 1,270 |  |
Notes receivable | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of days after which receivable is considered delinquent (in days) | 60 days |  | 60 days |  |
Notes receivable | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of days after which receivable is considered delinquent (in days) | 120 days |  | 120 days |  |
DTE Electric and DTE Gas |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Threshold period past due for write-off of trade accounts receivable (in days) |  |  | 150 days |  |
DTE Electric and DTE Gas | Accounts receivable |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of days after which receivable is considered delinquent (in days) | 21 days |  | 21 days |  |
DTE Electric |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Tax credits sold | $ 89 |  |  |  |
DTE Electric | Notes receivable |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Financing receivables | $ 158 |  | $ 158 |  |
DTE Electric | Notes receivable | Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of days after which receivable is considered delinquent (in days) | 60 days |  | 60 days |  |
DTE Electric | Notes receivable | Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of days after which receivable is considered delinquent (in days) | 120 days |  | 120 days |  |
DTE Electric | Affiliates | Federal taxes |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Income taxes receivable | $ 9 |  | $ 9 |  | $ 5
DTE Electric | Affiliates | State taxes |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Income taxes receivable | 3 |  | 3 |  |
DTE Electric | DTE Energy |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Allocated costs | $ 11 | $ 9 | $ 30 | $ 26 |

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