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LONG-TERM DEBT (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended
Aug. 07, 2020
Sep. 30, 2020
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Line of Credit Facility [Line Items]          
Repayments of senior debt     $ 650,000,000 $ 0  
Repayments of lines of credit   $ 2,000,000,000.0      
Committed line of credit borrowings     70,000,000 135,000,000 $ 2,000,000,000
Line of credit facility, remaining borrowing capacity     1,000,000,000.0    
Estimated fair value of long-term debt     1,700,000,000 $ 1,700,000,000 $ 3,500,000,000
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    
Committed line of credit borrowings     $ 70,000,000.0    
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    
Senior Notes          
Line of Credit Facility [Line Items]          
Repayments of senior debt $ 650,000,000        
Senior Notes, 3.875%, due August 2030 | Senior Notes          
Line of Credit Facility [Line Items]          
Debt instrument, face amount $ 650,000,000.0        
Interest rate 3.875%   3.875%