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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 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 | $ (42) | $ (428) | $ (277) | $ (215)
Transfers into Level 3 from Level 2 | 0 | (3) |  |
Transfers from Level 3 into Level 2 | 0 | (5) | 0 | 5
Total gains (losses) |  |  |  |
Included in earnings | 79 | 7 | 273 | (359)
Recorded in Regulatory liabilities | (2) | (4) | 3 | 20
Purchases, issuances, and settlements |  |  |  |
Settlements | (48) | 59 | (12) | 175
Net Assets (Liabilities) as of end of period | (13) | (374) | (13) | (374)
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 | 24 | 61 | 152 | (281)
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 | 1 | (1) | 10 | 16
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 | 14 | 25 | 11 | 9
Total gains (losses) |  |  |  |
Recorded in Regulatory liabilities | (2) | (4) | 3 | 20
Purchases, issuances, and settlements |  |  |  |
Settlements | (2) | (5) | (4) | (13)
Net Assets (Liabilities) as of end of period | 10 | 16 | 10 | 16
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 | 1 | (1) | 10 | 16
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 | (54) | (362) | (255) | (179)
Transfers into Level 3 from Level 2 | 0 | (3) |  |
Transfers from Level 3 into Level 2 | 0 | 0 | 0 | 5
Total gains (losses) |  |  |  |
Included in earnings | 1 | (32) | 163 | (382)
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | 25 | 84 | 64 | 243
Net Assets (Liabilities) as of end of period | (28) | (313) | (28) | (313)
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 | 4 | 29 | 94 | (248)
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 | (4) | (96) | (33) | (45)
Transfers into Level 3 from Level 2 | 0 | 0 |  |
Transfers from Level 3 into Level 2 | 0 | 0 | 0 | 0
Total gains (losses) |  |  |  |
Included in earnings | 79 | 40 | 109 | 22
Recorded in Regulatory liabilities | 0 | 0 | 0 | 0
Purchases, issuances, and settlements |  |  |  |
Settlements | (71) | (20) | (72) | (53)
Net Assets (Liabilities) as of end of period | 4 | (76) | 4 | (76)
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 | 26 | 37 | 94 | (2)
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 | 16 | 30 | 11 | 9
Transfers into Level 3 from Level 2 | 0 | 0 |  |
Transfers from Level 3 into Level 2 | 0 | (5) | 0 |
Total gains (losses) |  |  |  |
Included in earnings | (1) | (1) | 1 | 1
Recorded in Regulatory liabilities | (2) | (4) | 3 | 20
Purchases, issuances, and settlements |  |  |  |
Settlements | (2) | (5) | (4) | (15)
Net Assets (Liabilities) as of end of period | 11 | 15 | 11 | 15
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 | (6) | (5) | (36) | (31)
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 | $ 1 | $ (1) | $ 10 | $ 16

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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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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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