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Long-Term Debt - Revolving Credit Facility - Additional Information (Details)
1 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Apr. 02, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]        
Amount outstanding   $ 12,378,000,000   $ 11,833,000,000
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Amount drawn $ 995,000,000      
Amount outstanding   0    
Letters of credit issued against credit facility   2,000,000    
Remaining borrowing capacity   998,000,000    
Letter of credit sublimit as part of revolving credit facility   $ 125,000,000    
Minimum liquidity covenant, amount     $ 1,000,000,000  
Secured leverage ratio     6.50