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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 07, 2020
Sep. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Debt Instrument [Line Items]          
Committed line of credit borrowings       $ 2,000,000,000  
Repayments of senior debt     $ 650,000,000 $ 0 $ 0
Repayments of lines of credit   $ 2,000,000,000.0      
Line of credit facility, remaining borrowing capacity     1,700,000,000    
Long-term debt, maturities, repayments of principal in year three     500,000,000.0    
Long-term debt, maturities, repayments of principal in year six     350,000,000.0    
Long-term debt, maturities, repayments of principal in year eleven     $ 650,000,000.0    
Senior Notes          
Debt Instrument [Line Items]          
Repayments of senior debt $ 650,000,000        
2030 Senior Notes | Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 650,000,000.0        
Interest rate 3.875%   3.875%    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 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    
Swingline Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 200,000,000.0    
Standby Letters of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 50,000,000.0