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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 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 | $ (89) | $ (26) | $ 13 | $ 75
Transfers into Level 3 from Level 2 | 2 | 1 | 4 | 0
Transfers from Level 3 into Level 2 |  |  | 2 | 0
Total gains (losses) |  |  |  |
Included in earnings | 164 | 123 | 105 | 95
Recorded in Regulatory liabilities | 28 | 30 | 26 | 27
Purchases, issuances, and settlements |  |  |  |
Settlements | (91) | (90) | (136) | (159)
Net Assets (Liabilities) as of end of period | 14 | 38 | 14 | 38
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 | 63 | 69 | (27) | 32
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 | 30 | 28 | 30 | 28
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 | 3 | 3 | 9 | 7
Total gains (losses) |  |  |  |
Recorded in Regulatory liabilities | 28 | 30 | 26 | 27
Purchases, issuances, and settlements |  |  |  |
Settlements | (1) | (5) | (5) | (6)
Net Assets (Liabilities) as of end of period | 30 | 28 | 30 | 28
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 | 30 | 28 | 30 | 28
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 | 0 | (3) | (18) | 22
Transfers into Level 3 from Level 2 | 2 | 1 | 4 | 0
Transfers from Level 3 into Level 2 |  |  | 0 | 0
Total gains (losses) |  |  |  |
Included in earnings | (20) | 31 | (43) | 7
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | 9 | (26) | 48 | (26)
Net Assets (Liabilities) as of end of period | (9) | 3 | (9) | 3
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 | (11) | 20 | (21) | (18)
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 | (91) | (25) | 24 | 47
Transfers into Level 3 from Level 2 | 0 | 0 | 0 | 0
Transfers from Level 3 into Level 2 |  |  | 0 | 0
Total gains (losses) |  |  |  |
Included in earnings | 182 | 93 | 146 | 90
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | (99) | (59) | (178) | (128)
Net Assets (Liabilities) as of end of period | (8) | 9 | (8) | 9
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 | 72 | 80 | (7) | 81
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 | 2 | 2 | 7 | 6
Transfers into Level 3 from Level 2 | 0 | 0 | 0 | 0
Transfers from Level 3 into Level 2 |  |  | 2 | 0
Total gains (losses) |  |  |  |
Included in earnings | 2 | (1) | 2 | (2)
Recorded in Regulatory liabilities | 28 | 30 | 26 | 27
Purchases, issuances, and settlements |  |  |  |
Settlements | (1) | (5) | (6) | (5)
Net Assets (Liabilities) as of end of period | 31 | 26 | 31 | 26
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 | 2 | (31) | 1 | (31)
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 | $ 30 | $ 28 | $ 30 | $ 28

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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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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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