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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of beginning of period | $ 75 | $ (277)
Total gains (losses) |  |
Included in earnings | (29) | 107
Recorded in Regulatory liabilities | (2) | (9)
Purchases, issuances, and settlements |  |
Settlements | (70) | 81
Net Assets (Liabilities) as of end of period | (26) | (98)
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 | (38) | 114
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 | 2 | (2)
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 | 7 | 11
Total gains (losses) |  |
Recorded in Regulatory liabilities | (2) | (9)
Purchases, issuances, and settlements |  |
Settlements | (2) | (1)
Net Assets (Liabilities) as of end of period | 3 | 1
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 | 2 | (2)
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 | 22 | (255)
Total gains (losses) |  |
Included in earnings | (25) | 151
Recorded in Regulatory liabilities | 0 | 0
Purchases, issuances, and settlements |  |
Settlements | 0 | 42
Net Assets (Liabilities) as of end of period | (3) | (62)
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 | (39) | 94
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
Electricity |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of beginning of period | 47 | (33)
Total gains (losses) |  |
Included in earnings | (3) | (45)
Recorded in Regulatory liabilities | 0 | 0
Purchases, issuances, and settlements |  |
Settlements | (69) | 40
Net Assets (Liabilities) as of end of period | (25) | (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 | 1 | 19
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
Other |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Net Assets (Liabilities) as of beginning of period | 6 | 11
Total gains (losses) |  |
Included in earnings | (1) | 1
Recorded in Regulatory liabilities | (2) | (9)
Purchases, issuances, and settlements |  |
Settlements | (1) | (1)
Net Assets (Liabilities) as of end of period | 2 | 2
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 | 1
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 | $ 2 | $ (2)

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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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