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Retirement Benefits and Trusteed Assets (Tables)
 3 Months Ended
Mar. 31, 2024
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
2024202320242023
(In millions)
Three Months Ended March 31,
Service cost$14 $14 $4 $4 
Interest cost52 54 16 16 
Expected return on plan assets(85)(88)(30)(28)
Amortization of:
Net actuarial loss15 2 2 3 
Prior service credit(1)(1)(3)(4)
Settlements— 2 — — 
Net periodic benefit credit$(5)$(17)$(11)$(9)
The following table details the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
Three Months Ended March 31,
20242023
(In millions)
Service cost$3 $3 
Interest cost12 12 
Expected return on plan assets(20)(18)
Amortization of:
Prior service credit(1)(3)
Net periodic benefit credit$(6)$(6)