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Debt and Financing Activities - Revolving Credit Facilities (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Mar. 31, 2022
Mar. 31, 2021
Global Facility          
Line of Credit Facility [Line Items]          
Credit facility borrowing capacity $ 3,500,000,000 $ 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       $ 7,000,000  
Uncommitted balance       111,000,000  
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 $ 4,000,000,000 4,000,000,000    
Term of facility   5 years      
Amount borrowed under facility       0 $ 0
Credit facility outstanding       $ 0 $ 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 $ 3,600,000,000