Annual report pursuant to Section 13 and 15(d)

Debt - Revolving Credit Facility and Term Loan (Details)

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Debt - Revolving Credit Facility and Term Loan (Details)
1 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 11, 2019
USD ($)
May 07, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]            
Uncommitted option, to increase Credit Facility       $ 500,000,000    
Term Loan Credit Facility            
Line of Credit Facility [Line Items]            
Revolving credit agreement           $ 0
Unsecured Debt | Term Loan Credit Facility            
Line of Credit Facility [Line Items]            
Revolving credit facility     $ 1,450,000,000      
Proceeds from Term Loan Facility $ 1,450,000,000          
Revolving credit facility            
Line of Credit Facility [Line Items]            
Revolving credit facility       2,000,000,000.0 $ 1,500,000,000  
Revolving credit agreement   $ 93,000,000       $ 284,000,000
Ratio of debt to EBITDA   3.5        
Weighted average interest rate of outstanding borrowings   1.00%        
Letter of Credit            
Line of Credit Facility [Line Items]            
Weighted average interest rate of outstanding borrowings   0.90%        
Letter of Credit | Line of Credit            
Line of Credit Facility [Line Items]            
Revolving credit facility       300,000,000    
Swing Loan | Line of Credit            
Line of Credit Facility [Line Items]            
Revolving credit facility       $ 200,000,000