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Fair Value (Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Net Assets (Liabilities) as of beginning of period | $ 14 | $ 38 | $ 13 | $ 75
Transfers into Level 3 from Level 2 | 0 | 2 | 2 | 2
Transfers from Level 3 into Level 2 | (4) | 0 | 2 | 0
Total gains (losses) |  |  |  |
Included in earnings | 158 | 112 | 260 | 208
Recorded in Regulatory liabilities | (6) | 2 | 20 | 29
Purchases, issuances, and settlements |  |  |  |
Settlements | (119) | (111) | (254) | (271)
Net Assets (Liabilities) as of end of period | 43 | 43 | 43 | 43
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | 56 | 59 | 16 | 90
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | (5) | 2 | 18 | 21
DTE Electric |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Net Assets (Liabilities) as of beginning of period | 30 | 28 | 9 | 7
Total gains (losses) |  |  |  |
Recorded in Regulatory liabilities | (6) | 2 | 20 | 29
Purchases, issuances, and settlements |  |  |  |
Settlements | (6) | (9) | (11) | (15)
Net Assets (Liabilities) as of end of period | 18 | 21 | 18 | 21
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | (5) | 2 | 18 | 21
Natural gas |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Net Assets (Liabilities) as of beginning of period | (9) | 3 | (18) | 22
Transfers into Level 3 from Level 2 | 0 | 0 | 2 | 1
Transfers from Level 3 into Level 2 | (4) | 0 | 0 | 0
Total gains (losses) |  |  |  |
Included in earnings | 28 | 7 | (17) | 13
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | 4 | (15) | 52 | (41)
Net Assets (Liabilities) as of end of period | 19 | (5) | 19 | (5)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | 37 | (6) | 13 | (25)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | 0 | 0 | 0 | 0
Electricity |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Net Assets (Liabilities) as of beginning of period | (8) | 9 | 24 | 47
Transfers into Level 3 from Level 2 | 0 | 2 | 0 | 1
Transfers from Level 3 into Level 2 | 0 | 0 | 0 | 0
Total gains (losses) |  |  |  |
Included in earnings | 130 | 105 | 275 | 196
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | (117) | (87) | (294) | (215)
Net Assets (Liabilities) as of end of period | 5 | 29 | 5 | 29
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | 19 | 75 | 2 | 156
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | 0 | 0 | 0 | 0
Other |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Net Assets (Liabilities) as of beginning of period | 31 | 26 | 7 | 6
Transfers into Level 3 from Level 2 | 0 | 0 | 0 | 0
Transfers from Level 3 into Level 2 | 0 | 0 | 2 | 0
Total gains (losses) |  |  |  |
Included in earnings | 0 | 0 | 2 | (1)
Recorded in Regulatory liabilities | (6) | 2 | 20 | 29
Purchases, issuances, and settlements |  |  |  |
Settlements | (6) | (9) | (12) | (15)
Net Assets (Liabilities) as of end of period | 19 | 19 | 19 | 19
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | 0 | (10) | 1 | (41)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period | $ (5) | $ 2 | $ 18 | $ 21

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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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