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Retirement Benefits and Trusteed Assets (Tables)
 9 Months Ended
Sep. 30, 2024
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
2024202320242023
(In millions)
Three Months Ended September 30,
Service cost$14 $15 $4 $4 
Interest cost52 54 16 17 
Expected return on plan assets(86)(89)(30)(28)
Amortization of:
Net actuarial loss15 2 2 2 
Prior service credit
— (1)(3)(4)
Net periodic benefit credit
$(5)$(19)$(11)$(9)
Pension BenefitsOther Postretirement Benefits
2024202320242023
(In millions)
Nine Months Ended September 30,
Service cost$43 $43 $13 $13 
Interest cost156 161 47 49 
Expected return on plan assets(256)(264)(90)(83)
Amortization of:
Net actuarial loss44 5 5 7 
Prior service credit(1)(2)(8)(14)
Settlements— 7 — — 
Net periodic benefit credit$(14)$(50)$(33)$(28)
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,
2024202320242023
(In millions)
Service cost$3 $3 $10 $10 
Interest cost11 12 35 37 
Expected return on plan assets(20)(18)(59)(55)
Amortization of:
Net actuarial loss1 — 1 — 
Prior service credit(1)(3)(5)(10)
Net periodic benefit credit$(6)$(6)$(18)$(18)