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Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Feb. 07, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Line of Credit Facility [Line Items]        
Debt issuance costs     $ 24,000,000 $ 0
Credit Agreement        
Line of Credit Facility [Line Items]        
Syndicated credit agreement, amount $ 1,500,000,000      
Credit facility term     5 years  
Debt issuance costs 24,000,000      
Required net interest coverage ratio   3.00 3.00  
Interest expense   $ 15,000,000 $ 26,000,000  
Credit Agreement | Term Loan Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity 1,200,000,000      
Borrowings under lines of credit   1,200,000,000 $ 1,200,000,000  
Quarterly installment amortization rate     5.00%  
Unamortized debt issuance costs   21,000,000 $ 21,000,000  
Credit Agreement | Revolving Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity 300,000,000      
Potential increases in borrowing capacity 265,000,000      
Borrowings under lines of credit   0 0  
Remaining borrowing capacity   272,000,000 $ 272,000,000  
Unused capacity, commitment fee percentage     0.30%  
Credit Agreement | Letter of Credit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 35,000,000      
Letters of credit outstanding   $ 28,000,000 $ 28,000,000  
Credit Agreement | LIBOR        
Line of Credit Facility [Line Items]        
Interest rate floor   0.00%    
Credit Agreement | Alternate Base Rate        
Line of Credit Facility [Line Items]        
Interest rate floor   1.00%    
Credit Agreement | Alternate Base Rate | Term Loan Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   2.00%    
Credit Agreement | Alternate Base Rate | Revolving Facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.00%    
Credit Agreement | Minimum | Revolving Facility        
Line of Credit Facility [Line Items]        
Unused capacity, commitment fee percentage     0.175%  
Credit Agreement | Minimum | Alternate Base Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.25% 0.25%  
Credit Agreement | Maximum | Revolving Facility        
Line of Credit Facility [Line Items]        
Unused capacity, commitment fee percentage     0.35%  
Credit Agreement | Maximum | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   2.25%    
Credit Agreement | Maximum | Alternate Base Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.25%  
April 1, 2019 | Credit Agreement        
Line of Credit Facility [Line Items]        
Required leverage ratio   5.50 5.50  
2022 | Credit Agreement        
Line of Credit Facility [Line Items]        
Required leverage ratio   3.75 3.75