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Debt and Financing Activities - Revolving Credit Facilities (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Mar. 31, 2021
Global Facility      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity $ 3,500,000,000 $ 3,500,000,000  
Term of facility 5 years    
Amount borrowed under facility   0  
Line of Credit      
Line of Credit Facility [Line Items]      
Committed balance     $ 8,000,000
Uncommitted balance     152,000,000
Senior Unsecured Credit Facility (the 2020 Credit Facility) | Unsecured debt | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity $ 4,000,000,000.0 4,000,000,000.0  
Term of facility 5 years    
Amount borrowed under facility     0
Credit facility outstanding     $ 0
Senior Unsecured Credit Facility (the 2020 Credit Facility), Canadian Dollar, British Pound Sterling, and Euros Sublimit | Unsecured debt | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Credit facility borrowing capacity $ 3,600,000,000 $ 3,600,000,000