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Supplemental Financial Information - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Supplemental Balance Sheet Information [Line Items] |  |
Accounts payable | $ 2,498 | $ 2,369
Compensation-related accruals | 404 | 907
Taxes accrued | 287 | 232
Constellation Energy Generation, LLC |  |
Supplemental Balance Sheet Information [Line Items] |  |
Accounts payable | 2,466 | 2,348
Compensation-related accruals | 273 | 689
Taxes accrued | $ 278 | $ 223

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