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Fair Value (Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative assets |  |
Total derivative assets, gross | $ 609 | $ 694
Total derivative asset, netting | (437) | (447)
Derivative liabilities |  |
Total derivative liabilities, gross | (505) | (605)
Total derivative liability, netting | 402 | 430
DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 2,480 | 2,256
Current liabilities |  |
Derivative liabilities |  |
Total derivative liabilities, gross | (348) | (441)
Noncurrent liabilities |  |
Derivative liabilities |  |
Total derivative liabilities, gross | (157) | (164)
Natural gas |  |
Derivative assets |  |
Total derivative assets, gross | 344 | 428
Total derivative asset, netting | (255) | (285)
Derivative liabilities |  |
Total derivative liabilities, gross | (300) | (410)
Total derivative liability, netting | 230 | 272
Electricity |  |
Derivative assets |  |
Total derivative assets, gross | 191 | 187
Total derivative asset, netting | (126) | (116)
Derivative liabilities |  |
Total derivative liabilities, gross | (163) | (150)
Total derivative liability, netting | 131 | 114
Environmental & Other |  |
Derivative assets |  |
Total derivative assets, gross | 74 | 58
Total derivative asset, netting | (56) | (46)
Derivative liabilities |  |
Total derivative liabilities, gross | (41) | (44)
Total derivative liability, netting | 41 | 44
Cash equivalents | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 31 | 26
Private equity and other | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 362 | 349
Hedge funds and similar investments | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 241 | 228
Equity securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 1,139 | 1,003
Fixed income securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 707 | 650
Recurring |  |
Assets |  |
Cash equivalents and Restricted cash | 24 | 11
Derivative assets |  |
Total derivative asset, netting | (437) | (447)
Total derivative assets, net balance | 172 | 247
Total Assets | 2,796 | 2,622
Derivative liabilities |  |
Total derivative liability, netting | 402 | 430
Total Liabilities | (103) | (175)
Net Assets (Liabilities) at end of period | 2,693 | 2,447
Net Assets at end of period, netting | (35) | (17)
Recurring | DTE Electric |  |
Assets |  |
Cash equivalents and Restricted cash | 22 | 8
Derivative assets |  |
Total Assets | 2,569 | 2,318
Recurring | Current assets |  |
Derivative assets |  |
Total derivative asset, netting | (317) | (326)
Total Assets | 127 | 173
Recurring | Current assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 40 | 17
Recurring | Noncurrent assets |  |
Derivative assets |  |
Total derivative asset, netting | (120) | (121)
Total Assets | 2,669 | 2,449
Recurring | Noncurrent assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 2,529 | 2,301
Recurring | Current liabilities |  |
Derivative liabilities |  |
Total derivative liability, netting | 300 | 323
Total Liabilities | (48) | (118)
Recurring | Noncurrent liabilities |  |
Derivative liabilities |  |
Total derivative liability, netting | 102 | 107
Total Liabilities | (55) | (57)
Recurring | Restricted cash |  |
Assets |  |
Cash equivalents and Restricted cash | 22 | 8
Recurring | Natural gas |  |
Derivative assets |  |
Total derivative asset, netting | (255) | (285)
Total derivative assets, net balance | 89 | 143
Derivative liabilities |  |
Total derivative liability, netting | 230 | 272
Total derivative liabilities, net balance | (70) | (138)
Recurring | Electricity |  |
Derivative assets |  |
Total derivative asset, netting | (126) | (116)
Total derivative assets, net balance | 65 | 71
Derivative liabilities |  |
Total derivative liability, netting | 131 | 114
Total derivative liabilities, net balance | (32) | (36)
Recurring | Environmental & Other |  |
Derivative assets |  |
Total derivative asset, netting | (56) | (46)
Total derivative assets, net balance | 18 | 12
Derivative liabilities |  |
Total derivative liability, netting | 41 | 44
Total derivative liabilities, net balance | 0 | 0
Recurring | Other contracts |  |
Derivative assets |  |
Total derivative assets, net balance | 0 | 21
Derivative liabilities |  |
Total derivative liabilities, net balance | (1) | (1)
Recurring | Derivative assets — FTRs | DTE Electric |  |
Derivative assets |  |
Total derivative assets, net balance | 18 | 9
Recurring | Cash equivalents |  |
Assets |  |
Nuclear decommissioning trusts | 31 | 26
Other investments | 31 | 29
Recurring | Cash equivalents | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 31 | 26
Other investments | 19 | 19
Recurring | Private equity and other |  |
Assets |  |
Nuclear decommissioning trusts | 362 | 349
Recurring | Private equity and other | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 362 | 349
Recurring | Hedge funds and similar investments |  |
Assets |  |
Nuclear decommissioning trusts | 241 | 228
Recurring | Hedge funds and similar investments | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 241 | 228
Recurring | Equity securities |  |
Assets |  |
Nuclear decommissioning trusts | 1,139 | 1,003
Other investments | 81 | 72
Recurring | Equity securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 1,139 | 1,003
Other investments | 30 | 26
Recurring | Fixed income securities |  |
Assets |  |
Nuclear decommissioning trusts | 707 | 650
Other investments | 8 | 7
Recurring | Fixed income securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 707 | 650
Recurring | Level 1 |  |
Assets |  |
Cash equivalents and Restricted cash | 24 | 11
Derivative assets |  |
Total derivative assets, gross | 307 | 310
Total Assets | 1,802 | 1,602
Derivative liabilities |  |
Total Liabilities | (288) | (290)
Net Assets (Liabilities) at end of period | 1,514 | 1,312
Recurring | Level 1 | DTE Electric |  |
Assets |  |
Cash equivalents and Restricted cash | 22 | 8
Derivative assets |  |
Total Assets | 1,422 | 1,226
Recurring | Level 1 | Current assets |  |
Derivative assets |  |
Total Assets | 255 | 223
Recurring | Level 1 | Current assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 22 | 8
Recurring | Level 1 | Noncurrent assets |  |
Derivative assets |  |
Total Assets | 1,547 | 1,379
Recurring | Level 1 | Noncurrent assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 1,400 | 1,218
Recurring | Level 1 | Current liabilities |  |
Derivative liabilities |  |
Total Liabilities | (219) | (219)
Recurring | Level 1 | Noncurrent liabilities |  |
Derivative liabilities |  |
Total Liabilities | (69) | (71)
Recurring | Level 1 | Natural gas |  |
Derivative assets |  |
Total derivative assets, gross | 215 | 242
Derivative liabilities |  |
Total derivative liabilities, gross | (190) | (217)
Recurring | Level 1 | Electricity |  |
Derivative assets |  |
Total derivative assets, gross | 80 | 67
Derivative liabilities |  |
Total derivative liabilities, gross | (86) | (71)
Recurring | Level 1 | Environmental & Other |  |
Derivative assets |  |
Total derivative assets, gross | 12 | 1
Derivative liabilities |  |
Total derivative liabilities, gross | (12) | (2)
Recurring | Level 1 | Other contracts |  |
Derivative assets |  |
Total derivative assets, gross | 0 | 0
Derivative liabilities |  |
Total derivative liabilities, gross | 0 | 0
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric |  |
Derivative assets |  |
Total derivative assets, net balance | 0 | 0
Recurring | Level 1 | Cash equivalents |  |
Assets |  |
Nuclear decommissioning trusts | 31 | 26
Other investments | 31 | 29
Recurring | Level 1 | Cash equivalents | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 31 | 26
Other investments | 19 | 19
Recurring | Level 1 | Private equity and other |  |
Assets |  |
Nuclear decommissioning trusts | 8 | 16
Recurring | Level 1 | Private equity and other | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 8 | 16
Recurring | Level 1 | Hedge funds and similar investments |  |
Assets |  |
Nuclear decommissioning trusts | 225 | 151
Recurring | Level 1 | Hedge funds and similar investments | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 225 | 151
Recurring | Level 1 | Equity securities |  |
Assets |  |
Nuclear decommissioning trusts | 958 | 856
Other investments | 81 | 72
Recurring | Level 1 | Equity securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 958 | 856
Other investments | 30 | 26
Recurring | Level 1 | Fixed income securities |  |
Assets |  |
Nuclear decommissioning trusts | 129 | 124
Other investments | 8 | 7
Recurring | Level 1 | Fixed income securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 129 | 124
Recurring | Level 2 |  |
Assets |  |
Cash equivalents and Restricted cash | 0 | 0
Derivative assets |  |
Total derivative assets, gross | 149 | 218
Total Assets | 617 | 648
Derivative liabilities |  |
Total Liabilities | (107) | (162)
Net Assets (Liabilities) at end of period | 510 | 486
Recurring | Level 2 | DTE Electric |  |
Assets |  |
Cash equivalents and Restricted cash | 0 | 0
Derivative assets |  |
Total Assets | 468 | 430
Recurring | Level 2 | Current assets |  |
Derivative assets |  |
Total Assets | 97 | 170
Recurring | Level 2 | Current assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 0 | 0
Recurring | Level 2 | Noncurrent assets |  |
Derivative assets |  |
Total Assets | 520 | 478
Recurring | Level 2 | Noncurrent assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 468 | 430
Recurring | Level 2 | Current liabilities |  |
Derivative liabilities |  |
Total Liabilities | (74) | (129)
Recurring | Level 2 | Noncurrent liabilities |  |
Derivative liabilities |  |
Total Liabilities | (33) | (33)
Recurring | Level 2 | Natural gas |  |
Derivative assets |  |
Total derivative assets, gross | 30 | 81
Derivative liabilities |  |
Total derivative liabilities, gross | (30) | (70)
Recurring | Level 2 | Electricity |  |
Derivative assets |  |
Total derivative assets, gross | 76 | 69
Derivative liabilities |  |
Total derivative liabilities, gross | (47) | (52)
Recurring | Level 2 | Environmental & Other |  |
Derivative assets |  |
Total derivative assets, gross | 43 | 47
Derivative liabilities |  |
Total derivative liabilities, gross | (29) | (39)
Recurring | Level 2 | Other contracts |  |
Derivative assets |  |
Total derivative assets, gross | 0 | 21
Derivative liabilities |  |
Total derivative liabilities, gross | (1) | (1)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric |  |
Derivative assets |  |
Total derivative assets, net balance | 0 | 0
Recurring | Level 2 | Cash equivalents |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 2 | Cash equivalents | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 2 | Private equity and other |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Level 2 | Private equity and other | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Level 2 | Hedge funds and similar investments |  |
Assets |  |
Nuclear decommissioning trusts | 16 | 16
Recurring | Level 2 | Hedge funds and similar investments | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 16 | 16
Recurring | Level 2 | Equity securities |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 2 | Equity securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 2 | Fixed income securities |  |
Assets |  |
Nuclear decommissioning trusts | 452 | 414
Other investments | 0 | 0
Recurring | Level 2 | Fixed income securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 452 | 414
Recurring | Level 3 |  |
Assets |  |
Cash equivalents and Restricted cash | 0 | 0
Derivative assets |  |
Total derivative assets, gross | 153 | 166
Total Assets | 153 | 166
Derivative liabilities |  |
Total Liabilities | (110) | (153)
Net Assets (Liabilities) at end of period | 43 | 13
Recurring | Level 3 | DTE Electric |  |
Assets |  |
Cash equivalents and Restricted cash | 0 | 0
Derivative assets |  |
Total Assets | 18 | 9
Recurring | Level 3 | Current assets |  |
Derivative assets |  |
Total Assets | 92 | 106
Recurring | Level 3 | Current assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 18 | 9
Recurring | Level 3 | Noncurrent assets |  |
Derivative assets |  |
Total Assets | 61 | 60
Recurring | Level 3 | Noncurrent assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 0 | 0
Recurring | Level 3 | Current liabilities |  |
Derivative liabilities |  |
Total Liabilities | (55) | (93)
Recurring | Level 3 | Noncurrent liabilities |  |
Derivative liabilities |  |
Total Liabilities | (55) | (60)
Recurring | Level 3 | Natural gas |  |
Derivative assets |  |
Total derivative assets, gross | 99 | 105
Derivative liabilities |  |
Total derivative liabilities, gross | (80) | (123)
Recurring | Level 3 | Electricity |  |
Derivative assets |  |
Total derivative assets, gross | 35 | 51
Derivative liabilities |  |
Total derivative liabilities, gross | (30) | (27)
Recurring | Level 3 | Environmental & Other |  |
Derivative assets |  |
Total derivative assets, gross | 19 | 10
Derivative liabilities |  |
Total derivative liabilities, gross | 0 | (3)
Recurring | Level 3 | Other contracts |  |
Derivative assets |  |
Total derivative assets, gross | 0 | 0
Derivative liabilities |  |
Total derivative liabilities, gross | 0 | 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric |  |
Derivative assets |  |
Total derivative assets, net balance | 18 | 9
Recurring | Level 3 | Cash equivalents |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 3 | Cash equivalents | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 3 | Private equity and other |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Level 3 | Private equity and other | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Level 3 | Hedge funds and similar investments |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Level 3 | Hedge funds and similar investments | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Level 3 | Equity securities |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 3 | Equity securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 3 | Fixed income securities |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Other investments | 0 | 0
Recurring | Level 3 | Fixed income securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 0
Recurring | Other |  |
Derivative assets |  |
Total Assets | 661 | 653
Derivative liabilities |  |
Net Assets (Liabilities) at end of period | 661 | 653
Recurring | Other | DTE Electric |  |
Derivative assets |  |
Total Assets | 661 | 653
Recurring | Other | Noncurrent assets |  |
Derivative assets |  |
Total Assets | 661 | 653
Recurring | Other | Noncurrent assets | DTE Electric |  |
Derivative assets |  |
Total Assets | 661 | 653
Recurring | Other | Private equity and other |  |
Assets |  |
Nuclear decommissioning trusts | 354 | 333
Recurring | Other | Private equity and other | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 354 | 333
Recurring | Other | Hedge funds and similar investments |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 61
Recurring | Other | Hedge funds and similar investments | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 0 | 61
Recurring | Other | Equity securities |  |
Assets |  |
Nuclear decommissioning trusts | 181 | 147
Recurring | Other | Equity securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | 181 | 147
Recurring | Other | Fixed income securities |  |
Assets |  |
Nuclear decommissioning trusts | 126 | 112
Recurring | Other | Fixed income securities | DTE Electric |  |
Assets |  |
Nuclear decommissioning trusts | $ 126 | $ 112

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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