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Fair Value of Financial Instruments and Risk Management (Interest Rate Risk) (Details) - Interest Rate Swap - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Oct. 31, 2018
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |  |  |
Derivative, notional amount |  |  | $ 400,000,000 | $ 500,000,000
Fair value of interest rate swaps | $ (3,000,000) | $ (33,000,000) |  |
Unrealized net losses on interest rate swaps | 3,000,000 | 33,000,000 |  |
Other Current Liabilities |  |  |  |
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |  |  |
Fair value of interest rate swaps | (10,000,000) | (15,000,000) |  |
Other Liabilities |  |  |  |
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |  |  |
Fair value of interest rate swaps |  | $ (18,000,000) |  |
Other Assets |  |  |  |
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |  |  |
Fair value of interest rate swaps | $ 7,000,000 |  |  |
LIBOR |  |  |  |
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] |  |  |  |
Fixed interest rate |  |  | 0.965% | 3.055%

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