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Retirement Benefits and Trusteed Assets (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs (Credits)
The following table details 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 March 31,
Service cost$12 $14 $4 $4 
Interest cost54 52 15 16 
Expected return on plan assets(73)(85)(29)(30)
Amortization of:
Net actuarial loss22 15 — 2 
Prior service credit— (1)— (3)
Net periodic benefit cost (credit)$15 $(5)$(10)$(11)
The following table details the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
Three Months Ended March 31,
20252024
(In millions)
Service cost$3 $3 
Interest cost12 12 
Expected return on plan assets(19)(20)
Amortization of:
Net actuarial gain(1)— 
Prior service credit— (1)
Net periodic benefit credit$(5)$(6)