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Derivative Instruments - Schedule of Derivative Activity (Details) $ in Millions | Sep. 30, 2024 USD ($) MMBTU | Dec. 31, 2023 USD ($) MMBTU
--- | --- | ---
Derivative Assets Fair Value |  |
Natural gas derivatives | $ 1 | $ 0
Derivative Liability [Abstract] |  |
Derivative liability | 598 | 617
CERC |  |
Derivative Assets Fair Value |  |
Natural gas derivatives | 1 | 0
Derivative Liability [Abstract] |  |
Derivative liability | $ 6 | $ 11
Natural gas derivatives | Derivatives not designated as hedging instruments: |  |
Derivative Liability [Abstract] |  |
Derivative gross volume (in MMBtu) | MMBTU | 32,251 | 27,421
Natural gas derivatives | Derivatives not designated as hedging instruments: | CERC |  |
Derivative Liability [Abstract] |  |
Derivative gross volume (in MMBtu) | MMBTU | 27,644 | 23,504
Current Liabilities: Non-trading derivative liabilities | Natural gas derivatives | Derivatives not designated as hedging instruments: |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | $ 0 | $ 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | 5 | 9
Current Liabilities: Non-trading derivative liabilities | Natural gas derivatives | Derivatives not designated as hedging instruments: | CERC |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | 0 | 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | 4 | 8
Current Liabilities: Non-trading derivative liabilities | Indexed debt securities derivative | Derivatives not designated as hedging instruments: |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | 0 | 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | 591 | 605
Other Liabilities: Non-trading derivative liabilities | Natural gas derivatives | Derivatives not designated as hedging instruments: |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | 0 | 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | 2 | 3
Other Liabilities: Non-trading derivative liabilities | Natural gas derivatives | Derivatives not designated as hedging instruments: | CERC |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | 0 | 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | 2 | 3
Current Assets: Non-trading derivative assets | Natural gas derivatives | Derivatives not designated as hedging instruments: |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | 1 | 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | 0 | 0
Current Assets: Non-trading derivative assets | Natural gas derivatives | Derivatives not designated as hedging instruments: | CERC |  |
Derivative Assets Fair Value |  |
Derivative Assets Fair Value | 1 | 0
Derivative Liability [Abstract] |  |
Derivative Liabilities Fair Value | $ 0 | $ 0

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