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Debt (Details) - USD ($)
1 Months Ended 6 Months Ended
Oct. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Jun. 30, 2019
Debt Instrument [Line Items]          
Proceeds from long-term borrowings   $ 1,721,181,000 $ 1,000    
Commercial paper outstanding   $ 1,518,000,000     $ 586,000,000
Debt to debt-shareholders' equity ratio, maximum   0.65      
Debt to debt-shareholders' equity ratio   0.61      
Term Loan Due September 2023 | Medium-term Notes          
Debt Instrument [Line Items]          
Loan principle       $ 925,000,000  
Term Loan Due May 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 May 2022 | Term Loan          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.125%