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v3.25.3

Retirement Benefits and Trusteed Assets (Net Periodic Benefit Costs (Credits)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 12 | $ 14 | $ 36 | $ 43
Interest cost | 54 | 52 | 162 | 156
Expected return on plan assets | (73) | (86) | (218) | (256)
Net actuarial (gain) loss | 22 | 15 | 66 | 44
Prior service credit | (1) | 0 | (1) | (1)
Net periodic benefit cost (credit) | 14 | (5) | 45 | (14)
Pension Benefits | DTE Electric |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost (credit) | (12) | (1) | (39) | (4)
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 4 | 4 | 11 | 13
Interest cost | 15 | 16 | 46 | 47
Expected return on plan assets | (29) | (30) | (88) | (90)
Net actuarial (gain) loss | 0 | 2 | 1 | 5
Prior service credit | 0 | (3) | 0 | (8)
Net periodic benefit cost (credit) | (10) | (11) | (30) | (33)
Other Postretirement Benefits | DTE Electric |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2 | 3 | 8 | 10
Interest cost | 11 | 11 | 34 | 35
Expected return on plan assets | (20) | (20) | (58) | (59)
Net actuarial (gain) loss | (1) | 1 | (2) | 1
Prior service credit | 0 | (1) | 0 | (5)
Net periodic benefit cost (credit) | $ (8) | $ (6) | $ (18) | $ (18)

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