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Retirement Benefits and Trusteed Assets (Tables)
 6 Months Ended
Jun. 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 June 30,
Service cost$15 $14 $5 $5 
Interest cost52 53 15 16 
Expected return on plan assets(85)(87)(30)(27)
Amortization of:
Net actuarial loss14 1 1 2 
Prior service credit
— — (2)(6)
Settlements— 5 — — 
Net periodic benefit credit
$(4)$(14)$(11)$(10)
Pension BenefitsOther Postretirement Benefits
2024202320242023
(In millions)
Six Months Ended June 30,
Service cost$29 $28 $9 $9 
Interest cost104 107 31 32 
Expected return on plan assets(170)(175)(60)(55)
Amortization of:
Net actuarial loss29 3 3 5 
Prior service credit(1)(1)(5)(10)
Settlements— 7 — — 
Net periodic benefit credit$(9)$(31)$(22)$(19)
The following table details the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
(In millions)
Service cost$4 $4 $7 $7 
Interest cost12 13 24 25 
Expected return on plan assets(19)(19)(39)(37)
Amortization of:
Prior service credit(3)(4)(4)(7)
Net periodic benefit credit$(6)$(6)$(12)$(12)