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Derivative Instruments - Summary of Derivative Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement Impact of Derivative Activity [Abstract] |  |  |
Gain (loss) on derivative instruments not designated as hedging instruments | $ (27) | $ 325 | $ 50
Derivative, Credit Risk Related Contingent Features [Abstract] |  |  |
Aggregate fair value of derivatives containing material adverse change provisions in a net liability position | 9 | 0 |
Fair value of collateral already posted | 0 | 0 |
Additional collateral required to be posted if credit risk contingent features triggered | 9 | 0 |
CERC Corp |  |  |
Derivative, Credit Risk Related Contingent Features [Abstract] |  |  |
Aggregate fair value of derivatives containing material adverse change provisions in a net liability position | 8 | 0 |
Fair value of collateral already posted | 0 | 0 |
Additional collateral required to be posted if credit risk contingent features triggered | 8 | 0 |
Gains (Losses) in Other Income (Expense) | Indexed debt securities derivative |  |  |
Income Statement Impact of Derivative Activity [Abstract] |  |  |
Gain (loss) on derivative instruments not designated as hedging instruments | (27) | 325 | $ 50
Not Designated as Hedging Instrument |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 12 |
Derivative Liabilities Fair Value | 617 | 578 |
Not Designated as Hedging Instrument | CERC Corp |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 9 |
Derivative Liabilities Fair Value | 11 | 0 |
Not Designated as Hedging Instrument | Current Assets | Natural gas derivatives |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 9 |
Derivative Liabilities Fair Value | 0 | 0 |
Not Designated as Hedging Instrument | Current Assets | Natural gas derivatives | CERC Corp |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 7 |
Derivative Liabilities Fair Value | 0 | 0 |
Not Designated as Hedging Instrument | Current Assets | Interest rate derivatives |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 1 |
Derivative Liabilities Fair Value | 0 | 0 |
Not Designated as Hedging Instrument | Other Noncurrent Assets | Natural gas derivatives |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 2 |
Derivative Liabilities Fair Value | 0 | 0 |
Not Designated as Hedging Instrument | Other Noncurrent Assets | Natural gas derivatives | CERC Corp |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 2 |
Derivative Liabilities Fair Value | 0 | 0 |
Not Designated as Hedging Instrument | Current Liabilities | Natural gas derivatives |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 0 |
Derivative Liabilities Fair Value | 9 | 0 |
Not Designated as Hedging Instrument | Current Liabilities | Natural gas derivatives | CERC Corp |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 0 |
Derivative Liabilities Fair Value | 8 | 0 |
Not Designated as Hedging Instrument | Current Liabilities | Indexed debt securities derivative |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 0 |
Derivative Liabilities Fair Value | 605 | 578 |
Not Designated as Hedging Instrument | Other Noncurrent Liabilities | Natural gas derivatives |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 0 |
Derivative Liabilities Fair Value | 3 | 0 |
Not Designated as Hedging Instrument | Other Noncurrent Liabilities | Natural gas derivatives | CERC Corp |  |  |
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract] |  |  |
Derivative Assets Fair Value | 0 | 0 |
Derivative Liabilities Fair Value | $ 3 | $ 0 |

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