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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, 2023 | Dec. 31, 2022
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 | $ (277) | $ (215)
Transfers from Level 3 into Level 2 | 17 | 6
Total gains (losses) |  |
Included in earnings | 379 | (311)
Recorded in Regulatory liabilities | 9 | 21
Purchases, issuances, and settlements: |  |
Settlements | (53) | 222
Net Assets (Liabilities) as of December 31 | 75 | (277)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 114 | (276)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 7 | 11
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 | (255) | (179)
Transfers from Level 3 into Level 2 | 17 | 5
Total gains (losses) |  |
Included in earnings | 182 | (410)
Recorded in Regulatory liabilities | 0 | 0
Purchases, issuances, and settlements: |  |
Settlements | 78 | 329
Net Assets (Liabilities) as of December 31 | 22 | (255)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 85 | (215)
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 | (33) | (45)
Transfers from Level 3 into Level 2 | 0 | 1
Total gains (losses) |  |
Included in earnings | 198 | 97
Recorded in Regulatory liabilities | 0 | 0
Purchases, issuances, and settlements: |  |
Settlements | (118) | (86)
Net Assets (Liabilities) as of December 31 | 47 | (33)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 151 | 50
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 | 11 | 9
Transfers from Level 3 into Level 2 | 0 | 0
Total gains (losses) |  |
Included in earnings | (1) | 2
Recorded in Regulatory liabilities | 9 | 21
Purchases, issuances, and settlements: |  |
Settlements | (13) | (21)
Net Assets (Liabilities) as of December 31 | 6 | 11
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | (122) | (111)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | 7 | 11
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 | 11 | 9
Total gains (losses) |  |
Recorded in Regulatory liabilities | 9 | 21
Purchases, issuances, and settlements: |  |
Settlements | (13) | (19)
Net Assets (Liabilities) as of December 31 | 7 | 11
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31 | $ 7 | $ 11

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- Definition Amount of unrealized (holding) gain (loss) which is included in regulatory assets or liabilities related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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