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Selected Balance Sheet Data Selected Balance Sheet Data, Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Total inventories | $ 623 | $ 711
Materials and supplies |  |
Public Utilities, Inventory [Line Items] |  |
Inventories | 384 | 377
Fuel |  |
Public Utilities, Inventory [Line Items] |  |
Inventories | 192 | 211
Natural gas |  |
Public Utilities, Inventory [Line Items] |  |
Inventories | $ 47 | $ 123

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