XML 58 R45.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt and Credit Agreements - Narrative (Details) - USD ($)
6 Months Ended
Feb. 20, 2018
Jun. 30, 2018
Jun. 30, 2017
Line of Credit Facility      
Long-term debt issued   $ 2,000,000,000 $ 850,000,000
Notes due 2028      
Line of Credit Facility      
Long-term debt issued $ 800,000,000    
Interest rate (as a percent) 3.80%    
Notes due 2048      
Line of Credit Facility      
Long-term debt issued $ 850,000,000    
Interest rate (as a percent) 4.30%    
Notes due 2068      
Line of Credit Facility      
Long-term debt issued $ 350,000,000    
Interest rate (as a percent) 4.65%    
Unsecured Revolving Credit Facility | Credit Facility      
Line of Credit Facility      
Maximum borrowing capacity   $ 1,000,000,000  
Facility expiration date   May 21, 2020  
Amount outstanding   $ 0  
Receivables Securitization Facility | Line of Credit      
Line of Credit Facility      
Maximum borrowing capacity   $ 200,000,000  
Facility expiration date   Sep. 01, 2019  
Facility expiration period   3 years  
Outstanding balance   $ 0