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Retirement Benefits and Trusteed Assets | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Retirement Benefits and Trusteed Assets | RETIREMENT BENEFITS AND TRUSTEED ASSETS DTE Energy's subsidiary, DTE Energy Corporate Services, LLC, sponsors defined benefit pension plans and other postretirement benefit plans covering certain employees of the Registrants. Participants of all plans are solely DTE Energy and affiliate participants. The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:
| Pension Benefits |  | Other Postretirement Benefits
| 2025 |  | 2024 |  | 2025 |  | 2024
| (In millions)
Three Months Ended September 30, |  |  |  |  |  |  |
Service cost | $ | 12 |  |  | $ | 14 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost | 54 |  |  | 52 |  |  | 15 |  |  | 16 |
Expected return on plan assets | (73) |  |  | (86) |  |  | (29) |  |  | (30) |
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 22 |  |  | 15 |  |  | — |  |  | 2 |
Prior service credit | (1) |  |  | — |  |  | — |  |  | (3) |
Net periodic benefit cost (credit) | $ | 14 |  |  | $ | (5) |  |  | $ | (10) |  |  | $ | (11) |
| Pension Benefits |  | Other Postretirement Benefits
| 2025 |  | 2024 |  | 2025 |  | 2024
Nine Months Ended September 30, |  |  |  |  |  |  |
Service cost | $ | 36 |  |  | $ | 43 |  |  | $ | 11 |  |  | $ | 13 |
Interest cost | 162 |  |  | 156 |  |  | 46 |  |  | 47 |
Expected return on plan assets | (218) |  |  | (256) |  |  | (88) |  |  | (90) |
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 66 |  |  | 44 |  |  | 1 |  |  | 5 |
Prior service credit | (1) |  |  | (1) |  |  | — |  |  | (8) |
Net periodic benefit cost (credit) | $ | 45 |  |  | $ | (14) |  |  | $ | (30) |  |  | $ | (33) |
DTE Electric accounts for its participation in DTE Energy's qualified and non-qualified pension plans by applying multiemployer accounting. DTE Electric accounts for its participation in other postretirement benefit plans by applying multiple-employer accounting. Within multiemployer and multiple-employer plans, participants pool plan assets for investment purposes and to reduce the cost of plan administration. The primary difference between plan types is that assets contributed in multiemployer plans can be used to provide benefits for all participating employers, while assets contributed within a multiple-employer plan are restricted for use by the contributing employer. As a result of multiemployer accounting treatment, capitalized costs associated with these plans are reflected in Property, plant, and equipment in DTE Electric's Consolidated Statements of Financial Position. The same capitalized costs are reflected as Regulatory assets and liabilities in DTE Energy's Consolidated Statements of Financial Position. DTE Energy's subsidiaries are responsible for their share of qualified and non-qualified pension benefit costs. DTE Electric's allocated portion of pension benefit costs included in regulatory assets and liabilities, operation and maintenance expense, and capital expenditures was $12 million and $39 million for the three and nine months ended September 30, 2025, respectively, and credits of $1 million and $4 million for the three and nine months ended September 30, 2024, respectively. These amounts may include recognized contractual termination benefit charges, curtailment gains, and settlement charges. 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,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (In millions)
Service cost | $ | 2 |  |  | $ | 3 |  |  | $ | 8 |  |  | $ | 10 |
Interest cost | 11 |  |  | 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) |
Pension and Other Postretirement Contributions In September 2025, DTE Energy made a nominal contribution to the qualified pension plans and no contributions are currently expected for DTE Energy's postretirement benefit plans in 2025. Plans may be updated at the discretion of management and depending on economic and financial market conditions. DTE Energy anticipates a transfer of up to $25 million of non-represented qualified pension plan funds from DTE Gas to DTE Electric during the fourth quarter of 2025 in exchange for cash consideration.

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