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Borrowings - Narrative (Details)
1 Months Ended
Mar. 31, 2021
USD ($)
tranche
Apr. 30, 2021
USD ($)
program
Oct. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Asset-backed Debt Securities        
Line of Credit Facility [Line Items]        
Amount issued $ 1,000,000,000.0      
Number of tranches | tranche 6      
Discount rate at issuance 99.99%      
Weighted-average interest rate 0.49%      
Senior Notes        
Line of Credit Facility [Line Items]        
Repayments of senior debt $ 500,000,000      
Senior Notes | London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.68%      
Commercial Paper        
Line of Credit Facility [Line Items]        
Number of commercial paper programs | program   2    
Maximum borrowing capacity under commercial paper program       $ 4,750,000,000
Amount outstanding   $ 0 $ 0  
Commercial Paper | Euro Commercial Paper Program        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity under commercial paper program   3,000,000,000.0    
Commercial Paper | Euro Commercial Paper Certificate of Deposit Programme        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity under commercial paper program   1,000,000,000.0    
Commercial Paper | Hewlett Packard Enterprise | Euro Commercial Paper Certificate of Deposit Programme        
Line of Credit Facility [Line Items]        
Amount outstanding   $ 698,000,000 $ 677,000,000