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Debt (Narrative) (Details)
€ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
Mar. 30, 2021
USD ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Debt Instrument [Line Items]              
Repayment of debt       $ 462,800,000 $ 3,400,000    
Long-term debt proceeds       $ 160,900,000 4,895,700,000    
Payable in U.S. Dollars | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount         $ 3,800,000,000    
Payable in Euro | Senior Notes              
Debt Instrument [Line Items]              
Aggregate principal amount | €             € 1,000.0
Eurobonds 0.375% | Bonds              
Debt Instrument [Line Items]              
Interest rate (percent)       0.375%      
Repayment of debt | €     € 350.0        
Revolving credit agreement | 2021 Credit Agreement              
Debt Instrument [Line Items]              
Term of credit facility (in years) 5 years            
Maximum borrowing capacity $ 2,500,000,000            
Borrowings outstanding       $ 0      
Revolving credit agreement | 2021 Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Debt covenant, maximum ratio of total debt to capitalization 70.00%            
Revolving credit agreement | 2017 Credit Agreement              
Debt Instrument [Line Items]              
Term of credit facility (in years)   5 years          
Maximum borrowing capacity   $ 2,300,000,000          
Borrowings outstanding   0       $ 0  
Early termination penalties   $ 0          
Foreign credit facilities | Foreign subsidiaries facilities              
Debt Instrument [Line Items]              
Maximum borrowing capacity       296,200,000      
Borrowings outstanding       $ 157,900,000