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Borrowings and Other Financing Instruments Short-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Short-term Debt [Line Items] |  |  |  |
Amount outstanding at period end | $ 785 | $ 785 | $ 813 |
Commercial Paper |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 3,550 | 3,550 | 3,550 | $ 3,100
Amount outstanding at period end | 785 | 785 | 813 | 1,005
Average amount outstanding | 339 | 491 | 552 | 1,399
Maximum amount outstanding | $ 785 | $ 1,241 | $ 1,357 | $ 2,054
Weighted average interest rate, computed on a daily basis (percentage) | 5.51% | 5.12% | 1.47% | 0.57%
Weighted average interest rate at period end (percentage) | 5.52% | 5.52% | 4.66% | 0.31%

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