v3.25.2
Retirement Benefits and Trusteed Assets (Net Periodic Benefit Costs (Credits)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 12 $ 15 $ 24 $ 29
Interest cost 54 52 108 104
Expected return on plan assets (72) (85) (145) (170)
Net actuarial (gain) loss 22 14 44 29
Prior service credit 0 0 0 (1)
Net periodic benefit cost (credit) 16 (4) 31 (9)
Pension Benefits | DTE Electric        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost (credit) (13) (2) (27) (3)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 5 7 9
Interest cost 16 15 31 31
Expected return on plan assets (30) (30) (59) (60)
Net actuarial (gain) loss 1 1 1 3
Prior service credit 0 (2) 0 (5)
Net periodic benefit cost (credit) (10) (11) (20) (22)
Other Postretirement Benefits | DTE Electric        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 4 6 7
Interest cost 11 12 23 24
Expected return on plan assets (19) (19) (38) (39)
Net actuarial (gain) loss 0 0 (1) 0
Prior service credit 0 (3) 0 (4)
Net periodic benefit cost (credit) $ (5) $ (6) $ (10) $ (12)