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Debt and Credit Agreements - Narrative (Details) - USD ($)
Mar. 31, 2020
Mar. 30, 2020
Commercial Paper    
Line of Credit Facility    
Maximum borrowing capacity of credit facility $ 1,000,000,000.0  
Borrowings outstanding 0  
3.8% Notes Due 2050    
Line of Credit Facility    
Debt issued   $ 500,000,000
Debt interest rate percentage   3.80%
Unsecured Revolving Credit Facility | Credit Facility    
Line of Credit Facility    
Maximum borrowing capacity of credit facility 1,200,000,000  
Borrowings outstanding $ 0