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Debt and Credit Agreements - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Apr. 29, 2020
Mar. 30, 2020
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedge        
Line of Credit Facility        
Asset value of the forward interest rate swap $ 11,000,000 $ 11,000,000 $ 250,000,000  
Unrealized gains on forward interest rate swap 9,000,000 9,000,000    
Commercial Paper        
Line of Credit Facility        
Maximum borrowing capacity of credit facility 1,000,000,000.0 1,000,000,000.0    
Borrowings outstanding 0 0    
3.8% Notes Due 2050        
Line of Credit Facility        
Debt issued       $ 500,000,000
Debt interest rate percentage       3.80%
3.25% Notes Due 2027        
Line of Credit Facility        
Debt issued     $ 850,000,000  
Debt interest rate percentage     3.25%  
Unsecured Revolving Credit Facility | Credit Facility        
Line of Credit Facility        
Maximum borrowing capacity of credit facility 1,200,000,000 1,200,000,000    
Borrowings outstanding $ 0 $ 0