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Debt - Financing Activity and Covenants - Additional Information (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 793
Covenant restrictions [Abstract]  
Maximum consolidated leverage ratio 4.5
Calculated leverage ratio 3.5
Minimum required consolidated interest coverage ratio 3.0
Calculated consolidated interest coverage ratio 5.5
2017 Revolving Credit Facility [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 800
Line of Credit Facility, Remaining Borrowing Capacity 752
Letters of Credit Outstanding, Amount 48
Accounts Receivable Securitization [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 41