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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Net Assets (Liabilities) as of beginning of period | $ (98) | $ (341) | $ (277) | $ (215)
Transfers from Level 3 into Level 2 |  |  | 0 | 5
Total gains (losses) |  |  |  |
Included in earnings | 87 | (139) | 194 | (358)
Recorded in Regulatory liabilities | 14 | 28 | 5 | 24
Purchases, issuances, and settlements |  |  |  |
Settlements | (45) | 24 | 36 | 116
Net Assets (Liabilities) as of end of period | (42) | (428) | (42) | (428)
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 | 14 | (144) | 127 | (334)
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 | 14 | 25 | 14 | 25
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 | 1 | 3 | 11 | 9
Total gains (losses) |  |  |  |
Recorded in Regulatory liabilities | 14 | 28 | 5 | 24
Purchases, issuances, and settlements |  |  |  |
Settlements | (1) | (6) | (2) | (8)
Net Assets (Liabilities) as of end of period | 14 | 25 | 14 | 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 | 14 | 25 | 14 | 25
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 | (62) | (230) | (255) | (179)
Transfers from Level 3 into Level 2 |  |  | 0 | 5
Total gains (losses) |  |  |  |
Included in earnings | 11 | (175) | 162 | (347)
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | (3) | 43 | 39 | 159
Net Assets (Liabilities) as of end of period | (54) | (362) | (54) | (362)
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 | (3) | (145) | 90 | (274)
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 | (38) | (117) | (33) | (45)
Transfers from Level 3 into Level 2 |  |  | 0 | 0
Total gains (losses) |  |  |  |
Included in earnings | 75 | 33 | 30 | (18)
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | (41) | (12) | (1) | (33)
Net Assets (Liabilities) as of end of period | (4) | (96) | (4) | (96)
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 | 49 | 25 | 68 | (39)
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 | 6 | 11 | 9
Transfers from Level 3 into Level 2 |  |  | 0 |
Total gains (losses) |  |  |  |
Included in earnings | 1 | 3 | 2 | 7
Recorded in Regulatory liabilities | 14 | 28 | 5 | 24
Purchases, issuances, and settlements |  |  |  |
Settlements | (1) | (7) | (2) | (10)
Net Assets (Liabilities) as of end of period | 16 | 30 | 16 | 30
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 | (32) | (24) | (31) | (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 | $ 14 | $ 25 | $ 14 | $ 25

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