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Debt and Credit Agreements - Unrealized Amounts Related to Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Cash Flow Hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain - Net | $ 14 | $ 9 | $ 4 | $ 63

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