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Summary of Significant Accounting Policies Inventory (Tables) | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Related Disclosure - Inventory [Abstract] |
Public Utilities, Inventory | Inventory — Inventory is recorded at the lower of average cost or net realizable value and consisted of the following:
(Millions of Dollars) |  | Dec. 31, 2023 |  | Dec. 31, 2022
Inventories |  |  |  |
Materials and supplies |  | $ | 377 |  |  | $ | 330 |
Fuel |  | 211 |  |  | 201 |
Natural gas |  | 123 |  |  | 272 |
Total inventories |  | $ | 711 |  |  | $ | 803 |

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- Definition Tabular disclosure of all information related to inventories for utilities. + References No definition available. + Details
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- Definition Balance Sheet Related Disclosure - Inventory [Abstract] + References No definition available. + Details
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