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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of Regulatory Assets | The following are balances and a brief description of the Registrants' Regulatory assets and liabilities at December 31:
| DTE Energy |  | DTE Electric
| 2022 |  | 2021 |  | 2022 |  | 2021
Assets | (In millions)
Recoverable pension and other postretirement costs |  |  |  |  |  |  |
Pension | $ | 1,362 |  |  | $ | 1,372 |  |  | $ | 997 |  |  | $ | 1,056 |
Other postretirement costs | 172 |  |  | 53 |  |  | 60 |  |  | 27 |
Fermi 2 asset retirement obligation | 972 |  |  | 613 |  |  | 972 |  |  | 613 |
Recoverable undepreciated costs on retired plants | 594 |  |  | 667 |  |  | 594 |  |  | 667 |
Accrued PSCR/GCR revenue | 450 |  |  | 160 |  |  | 421 |  |  | 142 |
Recoverable Michigan income taxes | 148 |  |  | 163 |  |  | 121 |  |  | 133 |
Enhanced tree trimming program deferred costs | 90 |  |  | 189 |  |  | 90 |  |  | 189 |
Energy Waste Reduction incentive | 88 |  |  | 79 |  |  | 71 |  |  | 63 |
Recoverable income taxes related to AFUDC equity | 76 |  |  | 68 |  |  | 68 |  |  | 61 |
Deferred pension costs | 63 |  |  | 16 |  |  | 41 |  |  | — |
Deferred environmental costs | 46 |  |  | 51 |  |  | — |  |  | — |
Unamortized loss on reacquired debt | 45 |  |  | 51 |  |  | 34 |  |  | 38 |
Customer360 deferred costs | 42 |  |  | 46 |  |  | 42 |  |  | 46 |
Non-service pension and other postretirement costs | 32 |  |  | 25 |  |  | — |  |  | — |
Nuclear performance evaluation and review committee tracker | 26 |  |  | 39 |  |  | 26 |  |  | 39 |
Removal costs asset | 19 |  |  | — |  |  | 19 |  |  | — |
Advanced distribution management system costs | 14 |  |  | 9 |  |  | 14 |  |  | 9 |
Other recoverable income taxes | 14 |  |  | 16 |  |  | 14 |  |  | 16 |
Transitional Reconciliation Mechanism | 13 |  |  | 8 |  |  | 13 |  |  | 8 |
Energy Waste Reduction | 8 |  |  | 20 |  |  | — |  |  | — |
Other | 62 |  |  | 32 |  |  | 43 |  |  | 29 |
| 4,336 |  |  | 3,677 |  |  | 3,640 |  |  | 3,136 |
Less amount included in Current Assets | (450) |  |  | (195) |  |  | (421) |  |  | (168) |
| $ | 3,886 |  |  | $ | 3,482 |  |  | $ | 3,219 |  |  | $ | 2,968 |
Securitized regulatory assets | $ | 206 |  |  | $ | — |  |  | $ | 206 |  |  | $ | — |
Schedule of Regulatory Liabilities |
| DTE Energy |  | DTE Electric
| 2022 |  | 2021 |  | 2022 |  | 2021
Liabilities | (In millions)
Refundable federal income taxes | $ | 1,908 |  |  | $ | 2,117 |  |  | $ | 1,534 |  |  | $ | 1,729 |
Removal costs liability | 371 |  |  | 679 |  |  | — |  |  | 283 |
Negative other postretirement offset | 191 |  |  | 150 |  |  | 128 |  |  | 106 |
Non-service pension and other postretirement costs | 154 |  |  | 110 |  |  | 73 |  |  | 54 |
Renewable energy | 21 |  |  | 13 |  |  | 21 |  |  | 13 |
Energy Waste Reduction | 11 |  |  | 27 |  |  | 11 |  |  | 27 |
Incremental tree trim surge | 4 |  |  | 90 |  |  | 4 |  |  | 90 |
COVID-19 voluntary refund | — |  |  | 30 |  |  | — |  |  | 30 |
Other | 47 |  |  | 46 |  |  | 40 |  |  | 43 |
| 2,707 |  |  | 3,262 |  |  | 1,811 |  |  | 2,375 |
Less amount included in Current Liabilities | (34) |  |  | (156) |  |  | (33) |  |  | (154) |
| $ | 2,673 |  |  | $ | 3,106 |  |  | $ | 1,778 |  |  | $ | 2,221 |

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