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LONG-TERM DEBT (Narrative) (Details)
3 Months Ended
Apr. 30, 2020
USD ($)
Aug. 07, 2020
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Line of Credit Facility [Line Items]        
Committed line of credit borrowings $ 2,000,000,000   $ 2,000,000,000 $ 0
Estimated fair value of long-term debt 3,500,000,000   3,600,000,000 $ 1,600,000,000
Revolving credit facility        
Line of Credit Facility [Line Items]        
Aggregate principal amount     2,000,000,000.0  
Available increase in borrowing capacity     $ 500,000,000.0  
Maximum quarterly debt-to-EBITDA ratio     3.50  
Maximum annual debt-to-EBITDA ratio     4.50  
Minimum interest coverage ratio     2.50  
Proceeds from lines of credit $ 2,000,000,000.0      
Committed line of credit borrowings     $ 2,000,000,000.0  
Swingline Loans        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     200,000,000.0  
Standby Letters of Credit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 50,000,000.0  
Subsequent Event | 2030 Senior Notes | Senior Notes        
Line of Credit Facility [Line Items]        
Debt instrument, face amount   $ 650,000,000.0    
Interest rate   3.875%