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Borrowings - Additional Information (Details)
May 13, 2021
USD ($)
extension_option
May 15, 2020
Jan. 29, 2022
USD ($)
Jul. 31, 2021
USD ($)
Debt Instrument [Line Items]        
Derivative, notional amount     $ 6,982,000,000 $ 6,869,000,000
Revolving credit facility | Unsecured facility        
Debt Instrument [Line Items]        
Credit facility, term 5 years 364 days    
Maximum borrowing capacity $ 3,000,000,000      
Line of credit facility, amount outstanding     0  
Additional credit facility upon agreement (up to) $ 2,000,000,000      
Number of extension options | extension_option 2      
Revolving credit facility | Unsecured facility | U.S. dollars | Federal Funds rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.50%      
Revolving credit facility | Unsecured facility | U.S. dollars | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.00%      
Revolving credit facility | Unsecured facility | Pound Sterling | Minimum        
Debt Instrument [Line Items]        
Interest rate 0.00%      
Interest rate swaps | Fair Value Hedge | Derivatives designated as hedging instruments        
Debt Instrument [Line Items]        
Derivative, notional amount     2,000,000,000  
Commercial paper        
Debt Instrument [Line Items]        
Commercial paper, maximum borrowing limit (up to)     $ 10,000,000,000  
Interest rate     0.15% 0.00%