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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Long-term debt [Line Items]    
Less current portion $ (7) $ (7)
Total long-term debt 973 977
Term Loan Facility Maturing In 2025 [Member] | Secured Debt [Member]    
Long-term debt [Line Items]    
Long-term debt [1] 634 639
Unamortized debt issuance costs 7 8
Unamortized original issue discount 1 2
2026 Notes [Member] | Loans Payable [Member]    
Long-term debt [Line Items]    
Long-term debt [2] 345 344
Unamortized debt issuance costs 5 6
Other [Member]    
Long-term debt [Line Items]    
Long-term debt $ 1 $ 1
[1] As of December 31, 2019 and 2018, presented net of $7 million and $8 million, respectively, in unamortized debt issuance costs and $1 million and $2 million, respectively, in unamortized original issue discount paid.
[2] As of December 31, 2019 and 2018, presented net of $5 million and $6 million, respectively, in unamortized debt issuance costs.