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Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | $ 968 | $ 1,922
Derivative Liabilities | (970) | (2,169)
Current derivative assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 733 | 1,517
Current derivative liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | (657) | (1,535)
Noncurrent derivative assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 235 | 405
Noncurrent derivative liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liabilities | (313) | (634)
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 22 | 1
Foreign currency exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 1 | 1
Derivative Liabilities | (1) | (2)
Natural gas |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 441 | 744
Derivative Liabilities | (476) | (1,018)
Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 333 | 963
Derivative Liabilities | (318) | (935)
Environmental & Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 171 | 213
Derivative Liabilities | (175) | (214)
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 22 | 1
Derivative Liabilities | (1) | (2)
Derivatives designated as hedging instruments | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 22 | 1
Derivative Liabilities | 0 | 0
Derivatives designated as hedging instruments | Foreign currency exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 0 | 0
Derivative Liabilities | (1) | (2)
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 946 | 1,921
Derivative Liabilities | (969) | (2,167)
Derivatives not designated as hedging instruments | Foreign currency exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 1 | 1
Derivative Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Natural gas |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 441 | 744
Derivative Liabilities | (476) | (1,018)
Derivatives not designated as hedging instruments | Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 333 | 963
Derivative Liabilities | (318) | (935)
Derivatives not designated as hedging instruments | Environmental & Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | 171 | 213
Derivative Liabilities | (175) | (214)
Derivatives not designated as hedging instruments | FTRs | Other current assets | DTE Electric |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Assets | $ 10 | $ 11

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