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Business Acquisitions Additional Information (Details) - USD ($)
$ in Millions
4 Months Ended
Dec. 08, 2017
Jun. 23, 2017
Jun. 16, 2018
Associated Grocers Of Florida, Inc. [Member]      
Business Acquisition [Line Items]      
Total purchase price $ 193    
Payments for business acquisitions $ 131    
Business acquisition, percentage of voting interests acquired (as a percentage) 100.00%    
Assumption of debt $ 62    
Integration related costs     $ 3
Unified Grocers, Inc.      
Business Acquisition [Line Items]      
Total purchase price   $ 390  
Payments for business acquisitions   $ 114  
Business acquisition, percentage of voting interests acquired (as a percentage)   100.00%  
Assumption of debt   $ 276  
Integration related costs     $ 3