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Short-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 95 | $ 785
Commercial Paper |  |
Short-term Debt [Line Items] |  |
Borrowing limit | 3,550 | 3,550
Amount outstanding at period end | 95 | 785
Average amount outstanding | 644 | 491
Maximum amount outstanding | $ 1,080 | $ 1,241
Weighted average interest rate, computed on a daily basis | 5.50% | 5.12%
Weighted average interest rate at period end | 5.21% | 5.52%
Letter of Credit |  |
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 43 | $ 44

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