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Retirement Benefits and Trusteed Assets (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs (Credits)
The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:
Pension BenefitsOther Postretirement Benefits
2025202420252024
(In millions)
Three Months Ended September 30,
Service cost$12 $14 $4 $4 
Interest cost54 52 15 16 
Expected return on plan assets(73)(86)(29)(30)
Amortization of:
Net actuarial loss22 15 — 2 
Prior service credit(1)— — (3)
Net periodic benefit cost (credit)$14 $(5)$(10)$(11)
Pension BenefitsOther Postretirement Benefits
2025202420252024
Nine Months Ended September 30,
Service cost$36 $43 $11 $13 
Interest cost162 156 46 47 
Expected return on plan assets(218)(256)(88)(90)
Amortization of:
Net actuarial loss66 44 1 5 
Prior service credit(1)(1)— (8)
Net periodic benefit cost (credit)$45 $(14)$(30)$(33)
The following table details the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
(In millions)
Service cost$2 $3 $8 $10 
Interest cost11 11 34 35 
Expected return on plan assets(20)(20)(58)(59)
Amortization of:
Net actuarial (gain) loss(1)1 (2)1 
Prior service credit— (1)— (5)
Net periodic benefit credit$(8)$(6)$(18)$(18)