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Borrowings - Additional Information (Details) - USD ($)
May 15, 2020
May 14, 2020
Oct. 24, 2020
Jul. 25, 2020
Debt Instrument [Line Items]        
Derivative, notional amount     $ 7,459,000,000 $ 7,395,000,000
Unsecured revolving credit facility        
Debt Instrument [Line Items]        
Current borrowing capacity $ 2,750,000,000      
Credit facility, term 364 days 5 years    
Line of credit facility, amount outstanding     0  
Additional credit facility upon agreement (up to) $ 2,000,000,000.0      
Unsecured revolving credit facility | Federal Funds rate        
Debt Instrument [Line Items]        
Interest rate based on % above pre-defined variable rate 0.50%      
Unsecured revolving credit facility | LIBOR        
Debt Instrument [Line Items]        
Interest rate based on % above pre-defined variable rate 1.00%      
Unsecured revolving credit facility | Eurodollar        
Debt Instrument [Line Items]        
Interest rate based on % above pre-defined variable rate 0.25%      
Interest rate swaps | Derivatives designated as hedging instruments: | Derivatives Designated as Fair Value Hedging Instruments        
Debt Instrument [Line Items]        
Derivative, notional amount     2,500,000,000  
Commercial paper        
Debt Instrument [Line Items]        
Commercial paper, maximum borrowing limit (up to)     $ 10,000,000,000.0