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Debt (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]            
Proceeds from long-term borrowings     $ 1,721,211,000 $ 1,000    
Commercial paper outstanding   $ 949,000,000 $ 949,000,000     $ 586,000,000
Debt to debt-shareholders' equity ratio, maximum     0.65      
Debt to debt-shareholders' equity ratio     0.59      
Term Loan Due September 2023 | Medium-term Notes            
Debt Instrument [Line Items]            
Loan principle         $ 925,000,000  
Term Loan Due October 2022 | Term Loan            
Debt Instrument [Line Items]            
Proceeds from long-term borrowings $ 800,000,000          
Amended and Extended Multi-Currency Credit Agreement | Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 2,500,000,000  
London Interbank Offered Rate (LIBOR) | Term Loan Due September 2023 | Medium-term Notes            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.125%        
London Interbank Offered Rate (LIBOR) | Term Loan Due October 2022 | Term Loan            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.125%