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Debt and Credit Agreements - Narrative (Details) - USD ($)
Mar. 31, 2019
Mar. 29, 2019
Mar. 28, 2019
Feb. 28, 2019
Sep. 30, 2018
Commercial Paper          
Line of Credit Facility          
Maximum borrowing capacity of credit facility         $ 1,000,000,000.0
Borrowings outstanding $ 0        
Notes due 2029          
Line of Credit Facility          
Debt issued       $ 600,000,000  
Debt interest rate percentage       4.25%  
Notes due 2049          
Line of Credit Facility          
Debt issued       $ 400,000,000  
Debt interest rate percentage       4.50%  
Unsecured Revolving Credit Facility | Credit Facility          
Line of Credit Facility          
Maximum borrowing capacity of credit facility     $ 1,000,000,000.0    
Unsecured Revolving Credit Facility due 2024 | Credit Facility          
Line of Credit Facility          
Maximum borrowing capacity of credit facility   $ 1,200,000,000      
Borrowings outstanding $ 0