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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Change in accumulated postretirement benefit obligation |  |  |
Plan amendments | $ 0 | $ 4 |
Amounts recognized in Regulatory assets |  |  |
Regulatory assets | 4,336 | 3,677 |
Other postretirement benefit plan |  |  |
Change in accumulated postretirement benefit obligation |  |  |
Projected/Accumulated postretirement benefit obligation, beginning of year | 1,702 | 1,807 |
Service cost | 27 | 30 | $ 26
Interest cost | 48 | 46 | 56
Plan amendments | 0 | 1 |
Actuarial gain | (395) | (100) |
Benefits paid | (89) | (82) |
Projected/Accumulated postretirement benefit obligation, end of year | 1,293 | 1,702 | 1,807
Change in plan assets |  |  |
Plan assets at fair value, beginning of year | 2,021 | 1,960 |
Actual return on plan assets | (359) | 142 |
Benefits paid | (85) | (81) |
Plan assets at fair value, end of year | 1,577 | 2,021 | 1,960
Funded status | 284 | 319 |
Amount recorded as: |  |  |
Noncurrent assets | 571 | 678 |
Current liabilities | 0 | (1) |
Noncurrent liabilities | (287) | (358) |
Defined benefit plans assets (liabilities) | 284 | 319 |
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax |  |  |
Net actuarial gain | (14) | (1) |
Amounts recognized in Regulatory assets |  |  |
Net actuarial loss | 201 | 102 |
Prior service credit | (29) | (49) |
Regulatory assets | 172 | 53 |
DTE Electric |  |  |
Amounts recognized in Regulatory assets |  |  |
Regulatory assets | 3,640 | 3,136 |
DTE Electric | Other postretirement benefit plan |  |  |
Change in accumulated postretirement benefit obligation |  |  |
Projected/Accumulated postretirement benefit obligation, beginning of year | 1,293 | 1,369 |
Service cost | 20 | 23 | 20
Interest cost | 37 | 35 | 43
Plan amendments | 0 | 0 |
Actuarial gain | (301) | (73) |
Benefits paid | (67) | (61) |
Projected/Accumulated postretirement benefit obligation, end of year | 982 | 1,293 | 1,369
Change in plan assets |  |  |
Plan assets at fair value, beginning of year | 1,355 | 1,320 |
Actual return on plan assets | (239) | 96 |
Benefits paid | (64) | (61) |
Plan assets at fair value, end of year | 1,052 | 1,355 | $ 1,320
Funded status | 70 | 62 |
Amount recorded as: |  |  |
Noncurrent assets | 345 | 402 |
Current liabilities | 0 | 0 |
Noncurrent liabilities | (275) | (340) |
Defined benefit plans assets (liabilities) | 70 | 62 |
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax |  |  |
Net actuarial gain | 0 | 0 |
Amounts recognized in Regulatory assets |  |  |
Net actuarial loss | 80 | 61 |
Prior service credit | (20) | (34) |
Regulatory assets | $ 60 | $ 27 |

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