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Debt and Financing Activities - Revolving Credit Facilities (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2019
Dec. 31, 2020
Sep. 30, 2019
Dec. 31, 2020
Mar. 31, 2020
Revolving Credit Facility | Global Facility          
Line of Credit Facility [Line Items]          
Syndicated senior unsecured revolving credit facility $ 3,500,000,000   $ 3,500,000,000    
Syndicated senior unsecured revolving credit facility term 5 years        
Line of Credit          
Line of Credit Facility [Line Items]          
Committed balance   $ 8,000,000   $ 8,000,000  
Uncommitted balance   183,000,000   183,000,000  
Unsecured Debt | Revolving Credit Facility | The 2020 Credit Facility          
Line of Credit Facility [Line Items]          
Syndicated senior unsecured revolving credit facility $ 4,000,000,000   $ 4,000,000,000    
Syndicated senior unsecured revolving credit facility term     5 years    
Borrowings under facility   0   0  
Amounts outstanding under facility   $ 0   $ 0 $ 0
Unsecured Debt | Revolving Credit Facility | Canadian Dollar, British Pound Sterling, and Euros Sublimit          
Line of Credit Facility [Line Items]          
Syndicated senior unsecured revolving credit facility $ 3,600,000,000   $ 3,600,000,000