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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt, net of current maturities $ 645 $ 663
Credit Agreement [Member]    
Debt Instrument [Line Items]    
Deferred financing costs (2) (2)
Term Loan [Member] | Credit Agreement [Member]    
Debt Instrument [Line Items]    
Term Loan 685 703
Current maturities $ (38) $ (38)