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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Surrender Value, Fair Value Disclosure $ 26 $ 29
Long-term Debt 2,618 2,597
Unamortized Debt Issuance Expense 11 11
Long-term Debt, Fair Value $ 3,180 $ 3,039