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Short-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2022 | Dec. 31, 2021
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 136 | $ 1,005
Commercial Paper |  |
Short-term Debt [Line Items] |  |
Borrowing limit | 3,100 | 3,100
Amount outstanding at period end | 136 | 1,005
Average amount outstanding | 554 | 1,399
Maximum amount outstanding | $ 1,136 | $ 2,054
Weighted average interest rate, computed on a daily basis | 1.05% | 0.57%
Weighted average interest rate at period end | 1.90% | 0.31%

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