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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, net of current maturities $ 2,430 $ 700
Credit Agreement [Member]    
Debt Instrument [Line Items]    
Deferred financing costs (3) (3)
Term Loan [Member] | Credit Agreement [Member]    
Debt Instrument [Line Items]    
Term loan 731 741
Current maturities (38) (38)
Revolving Credit Facility [Member] | Unsecured Debt [Member] | Credit Agreement [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit $ 1,740 $ 0