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Borrowings - Narrative (Details)
May 26, 2021
USD ($)
Apr. 30, 2021
USD ($)
commercial_paper_program
Line of Credit Facility [Line Items]    
Number of commercial paper programs | commercial_paper_program   2
Commercial paper    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under credit facility   $ 6,000,000,000.0
Revolving credit facility | Senior Unsecured Committed Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under credit facility   4,000,000,000.0
Revolving credit facility | Revolving Credit Facility, 364-Day    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under credit facility   1,000,000,000.0
Senior unsecured revolving credit facility | Subsequent event    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under credit facility $ 5,000,000,000.0  
Revolving credit facility, term 5 years  
Credit facilities    
Line of Credit Facility [Line Items]    
Available borrowing resources   $ 634,000,000