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Debt - Summary of Debt Instruments Narrative (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
Sep. 30, 2019
USD ($)
Dec. 31, 2018
Aug. 02, 2019
USD ($)
Jan. 22, 2019
USD ($)
Debt Instrument [Line Items]            
Unused facility fee, as percentage of unused portion     0.30%      
Securitization Facility            
Debt Instrument [Line Items]            
Amended securitization facility $ 1,200,000,000   $ 1,200,000,000      
Unused facility fee, as percentage of unused portion     0.40% 0.40%    
Program fee     one month LIBOR      
Term Loan A            
Debt Instrument [Line Items]            
Effective interest rate     3.54%      
Term Loan B            
Debt Instrument [Line Items]            
Effective interest rate     4.04%      
Commercial Paper | Securitization Facility            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.89% 0.80%      
Program fee rate 2.06% 2.52%        
Secured Debt            
Debt Instrument [Line Items]            
Additional borrowing capacity $ 750,000,000   $ 750,000,000      
Leverage ratio 3.00   3.00      
Secured Debt | Term Loan A            
Debt Instrument [Line Items]            
Amended securitization facility $ 3,225,000,000   $ 3,225,000,000      
Secured Debt | Term Loan B            
Debt Instrument [Line Items]            
Amended securitization facility 350,000,000   350,000,000      
Secured Debt | Revolving Credit Facility            
Debt Instrument [Line Items]            
Amended securitization facility 1,285,000,000   1,285,000,000      
Secured Debt | Revolving A Facility            
Debt Instrument [Line Items]            
Amended securitization facility 800,000,000   800,000,000      
Secured Debt | Revolving B Facility            
Debt Instrument [Line Items]            
Amended securitization facility 450,000,000   450,000,000      
Secured Debt | Revolving C Facility            
Debt Instrument [Line Items]            
Amended securitization facility 35,000,000   35,000,000      
Secured Debt | Incremental Term Loan A            
Debt Instrument [Line Items]            
Amended securitization facility         $ 700,000,000  
Variable Rate Debt            
Debt Instrument [Line Items]            
Long-term debt $ 2,000,000,000.0   $ 2,000,000,000.0     $ 2,000,000,000.0
Eurodollar | Secured Debt | Term Loan B            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.00%      
Base Rate | Secured Debt | Term Loan B            
Debt Instrument [Line Items]            
Basis spread on variable rate     1.00%      
London Interbank Offered Rate (LIBOR) | Commercial Paper | Securitization Facility            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.90%      
Blended Rate Of LIBOR And Commercial Paper Rates Based On Weighted Average Advance | Commercial Paper | Securitization Facility            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.88%          
Minimum | Secured Debt            
Debt Instrument [Line Items]            
Unused facility fee, as percentage of unused portion     0.25%      
Minimum | Federal Funds Rate Plus | Secured Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.50%      
Maximum | Secured Debt            
Debt Instrument [Line Items]            
Unused facility fee, as percentage of unused portion     0.35%      
Maximum | Eurodollar | Secured Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate     1.00%