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Retirement Benefits and Trusteed Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
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 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) |
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) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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