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Debt and Financing Arrangements - Narrative (Details)
3 Months Ended 12 Months Ended
Oct. 31, 2021
USD ($)
Jul. 31, 2021
USD ($)
Apr. 30, 2022
USD ($)
Bank
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Aug. 19, 2021
USD ($)
Debt and Financing Arrangements (Textual) [Abstract]            
Debt instrument face amount     $ 4,350,000,000 $ 4,700,000,000    
Repayment of long-term debt     1,157,000,000 700,000,000.0 $ 900,000,000.0  
Short-term borrowings     $ 180,000,000.0 82,000,000.0    
Percentage of the principal amount thereof which company can prepay     100.00%      
Interest paid     $ 155,200,000 169,900,000 193,400,000  
Commercial Paper [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Commercial paper, borrowing capacity     2,000,000,000 1,800,000,000   $ 1,800,000,000
Short-term borrowings     $ 180,000,000.0 $ 82,000,000.0    
Commercial paper weighted-average interest rate     0.65% 0.17%    
Senior Notes [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Debt instrument face amount $ 800,000,000.0       800,000,000.0  
Debt issuance costs 7,200,000          
Debt Instrument, Unamortized Discount 2,400,000          
3.50% Senior Notes due October 15, 2021            
Debt and Financing Arrangements (Textual) [Abstract]            
Debt instrument face amount     $ 0 $ 750,000,000.0    
Repayment of long-term debt $ 750,000,000.0          
3.00% Senior Notes due March 15, 2022            
Debt and Financing Arrangements (Textual) [Abstract]            
Debt instrument face amount     $ 0 400,000,000.0    
Repayment of long-term debt   $ 400,000,000.0        
3.00% Senior Notes due March 15, 2022 | Other Nonoperating Income (Expense)            
Debt and Financing Arrangements (Textual) [Abstract]            
Gain (Loss) on Extinguishment of Debt   $ (6,900,000)        
Revolving Credit Facility [Member]            
Debt and Financing Arrangements (Textual) [Abstract]            
Debt issuance costs           4,300,000
Number of banks | Bank     11      
Revolving credit facility maximum borrowing capacity     $ 2,000,000,000 1,800,000,000   $ 1,800,000,000
Outstanding balance under revolving credit facility     $ 0 $ 0    
2.50% Senior Notes due March 15, 2020            
Debt and Financing Arrangements (Textual) [Abstract]            
Repayment of long-term debt         500,000,000.0  
Interest Rate Contracts            
Derivative Instruments, Gain (Loss) [Line Items]            
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss         $ (239,800,000)