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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Surrender Value, Fair Value Disclosure $ 33 $ 33
Long-term Debt 2,906 3,046
Unamortized Debt Issuance Expense 12 13
Long-term Debt, Fair Value $ 3,359 $ 3,808