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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Purchases, issuances, and settlements: |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Non-utility operations, Fuel, purchased power, and gas — utility | Non-utility operations, Fuel, purchased power, and gas — utility
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Non-utility operations, Fuel, purchased power, and gas — utility | Non-utility operations, Fuel, purchased power, and gas — utility
Recurring |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of January 1 | $ 75 | $ (277)
Transfers into Level 3 from Level 2 | 1 | 0
Transfers from Level 3 into Level 2 | 74 | 17
Total gains (losses) |  |
Included in earnings | 240 | 379
Recorded in Regulatory liabilities | 21 | 9
Purchases, issuances, and settlements: |  |
Settlements | (398) | (53)
Net Assets (Liabilities) as of December 31 | 13 | 75
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | (88) | 114
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 9 | 7
Recurring | Natural Gas |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of January 1 | 22 | (255)
Transfers into Level 3 from Level 2 | 1 | 0
Transfers from Level 3 into Level 2 | 0 | 17
Total gains (losses) |  |
Included in earnings | 16 | 182
Recorded in Regulatory liabilities | 0 | 0
Purchases, issuances, and settlements: |  |
Settlements | (57) | 78
Net Assets (Liabilities) as of December 31 | (18) | 22
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | (47) | 85
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 0 | 0
Recurring | Electricity |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of January 1 | 47 | (33)
Transfers into Level 3 from Level 2 | 0 | 0
Transfers from Level 3 into Level 2 | 74 | 0
Total gains (losses) |  |
Included in earnings | 225 | 198
Recorded in Regulatory liabilities | 0 | 0
Purchases, issuances, and settlements: |  |
Settlements | (322) | (118)
Net Assets (Liabilities) as of December 31 | 24 | 47
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 118 | 151
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 0 | 0
Recurring | Other |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of January 1 | 6 | 11
Transfers into Level 3 from Level 2 | 0 | 0
Transfers from Level 3 into Level 2 | 0 | 0
Total gains (losses) |  |
Included in earnings | (1) | (1)
Recorded in Regulatory liabilities | 21 | 9
Purchases, issuances, and settlements: |  |
Settlements | (19) | (13)
Net Assets (Liabilities) as of December 31 | 7 | 6
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | (159) | (122)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 9 | 7
Recurring | DTE Electric |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of January 1 | 7 | 11
Total gains (losses) |  |
Recorded in Regulatory liabilities | 21 | 9
Purchases, issuances, and settlements: |  |
Settlements | (19) | (13)
Net Assets (Liabilities) as of December 31 | 9 | 7
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | $ 9 | $ 7

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