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Borrowings - Narrative (Details)
1 Months Ended
Sep. 30, 2019
USD ($)
tranche
Oct. 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
tranche
Apr. 30, 2020
USD ($)
tranche
Apr. 09, 2020
USD ($)
Mar. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Forecast [Member]              
Line of Credit Facility [Line Items]              
Repayments of long-term debt   $ 3,000,000,000.0          
4.45% Senior Notes Due October 2023 | Senior Notes              
Line of Credit Facility [Line Items]              
Amount issued         $ 1,250,000,000    
Stated interest rate         4.45%    
4.65% Senior Notes Due October 2024 | Senior Notes              
Line of Credit Facility [Line Items]              
Amount issued         $ 1,000,000,000.0    
Stated interest rate         4.65%    
3.6%Senior Notes Due October 2020 | Senior Notes | Forecast [Member]              
Line of Credit Facility [Line Items]              
Stated interest rate   3.60%          
February 2020 Asset Backed Securities | Asset-backed Debt Securities              
Line of Credit Facility [Line Items]              
Amount issued     $ 755,000,000        
Number of tranches | tranche     6        
Discount rate at issuance     99.99%        
Weighted-average interest rate     1.87%        
Outstanding balance       $ 704,000,000      
September 2019 Asset Backed Securities | Asset-backed Debt Securities              
Line of Credit Facility [Line Items]              
Amount issued $ 763,000,000            
Number of tranches | tranche 6            
Discount rate at issuance 99.99%            
Weighted-average interest rate 2.31%            
Outstanding balance       $ 541,000,000      
Commercial Paper              
Line of Credit Facility [Line Items]              
Number of commercial paper programs | tranche       2      
Maximum borrowing capacity under commercial paper program     $ 4,000,000,000.0     $ 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       $ 605,000,000     $ 698,000,000