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Fair Value Measurements - Interest Rate Derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Jul. 09, 2020 | Apr. 29, 2020
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Interest Rate Swap | Cash Flow Hedge | Designated as Hedging Instrument |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Asset value of the forward interest rate swap | $ 116 | $ 80 | $ 500 | $ 250

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