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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, net of current maturities $ 727 $ 736
Term Loan [Member]    
Debt Instrument [Line Items]    
Term loan 750 750
Current maturities (19) (9)
Deferred financing costs (4) (5)
Long-term debt, net of current maturities $ 727 $ 736