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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Abstract] |  |  |
Depreciation expense expressed as a percentage of average depreciable property | 3.60% | 3.70% | 3.50%
Nuclear Decommissioning [Abstract] |  |  |
Studies time periods | 3 years |  |
Cash and Cash Equivalents [Abstract] |  |  |
maturity period | 3 months |  |
Accounts, Notes, Loans and Financing Receivable |  |  |
Allowance for bad debts | $ 128 | $ 122 |
Alternative Revenue Programs [Abstract] |  |  |
maximum number of months following end of annual period in which revenues are earned to be included in | 24 months |  |
Inventories | $ 711 | 803 |
Studies time periods | 3 years |  |
maximum number of months following end of annual period in which revenues are earned to be included in | 24 months |  |
maturity period | 3 months |  |
Supplies [Member] |  |  |
Inventories | $ 377 | 330 |
Public Utilities, Inventory, Fuel [Member] |  |  |
Inventories | 211 | 201 |
Public Utilities, Inventory, Natural Gas [Member] |  |  |
Inventories | $ 123 | $ 272 |

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