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Acquisition - Acquisition of Express Mart (Details)
$ in Millions
Nov. 16, 2018
USD ($)
Store
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Goodwill   $ 20,277 $ 20,184
Express Mart      
Business Acquisition [Line Items]      
Number of stores | Store 78    
Cash consideration $ 266    
Property, plant and equipment, net 97    
Inventories 9    
Finite-lived intangibles 2    
Goodwill $ 158