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Retirement Benefits and Trusteed Assets (OPEB - Reconciliation of Obligations, Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amounts recognized in Regulatory assets (liabilities) |  |  |
Regulatory liability | $ (3,037) | $ (2,674) |
Regulatory assets | 6,821 | 6,317 |
Other postretirement benefit plan |  |  |
Change in accumulated postretirement benefit obligation |  |  |
Projected/Accumulated postretirement benefit obligation, beginning of year | 1,283 | 1,293 |
Service cost | 18 | 17 | $ 27
Interest cost | 62 | 65 | 48
Actuarial (gain) loss | (165) | (5) |
Benefits paid | (75) | (87) |
Projected/Accumulated postretirement benefit obligation, end of year | 1,123 | 1,283 | 1,293
Change in plan assets |  |  |
Plan assets at fair value, beginning of year | 1,614 | 1,577 |
Actual return on plan assets | 58 | 124 |
Benefits paid | (78) | (87) |
Plan assets at fair value, end of year | 1,594 | 1,614 | 1,577
Funded status | 471 | 331 |
Amount recorded as: |  |  |
Noncurrent assets | 705 | 633 |
Current liabilities | (1) | (1) |
Noncurrent liabilities | (233) | (301) |
Defined benefit plans assets (liabilities) | 471 | 331 |
Amounts recognized in Accumulated other comprehensive income, pre-tax |  |  |
Net actuarial gain | (14) | (13) |
Amounts recognized in Regulatory assets (liabilities) |  |  |
Net actuarial (gain) loss | 65 | 173 |
Prior service credit | 0 | (10) |
Regulatory assets | 65 | 163 |
DTE Electric |  |  |
Amounts recognized in Regulatory assets (liabilities) |  |  |
Regulatory liability | (1,909) | (1,759) |
Regulatory assets | 6,226 | 5,695 |
DTE Electric | Other postretirement benefit plan |  |  |
Change in accumulated postretirement benefit obligation |  |  |
Projected/Accumulated postretirement benefit obligation, beginning of year | 982 | 982 |
Service cost | 14 | 13 | 20
Interest cost | 47 | 49 | 37
Actuarial (gain) loss | (139) | 2 |
Benefits paid | (55) | (64) |
Projected/Accumulated postretirement benefit obligation, end of year | 849 | 982 | 982
Change in plan assets |  |  |
Plan assets at fair value, beginning of year | 1,070 | 1,052 |
Actual return on plan assets | 40 | 81 |
Benefits paid | (58) | (63) |
Plan assets at fair value, end of year | 1,052 | 1,070 | $ 1,052
Funded status | 203 | 88 |
Amount recorded as: |  |  |
Noncurrent assets | 428 | 378 |
Current liabilities | 0 | 0 |
Noncurrent liabilities | (225) | (290) |
Defined benefit plans assets (liabilities) | 203 | 88 |
Amounts recognized in Accumulated other comprehensive income, pre-tax |  |  |
Net actuarial gain | 0 | 0 |
Amounts recognized in Regulatory assets (liabilities) |  |  |
Net actuarial (gain) loss | (26) | 73 |
Prior service credit | 0 | (6) |
Regulatory liability | $ (26) |  |
Regulatory assets |  | $ 67 |

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