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LONG-TERM DEBT - ABL Credit Facility (Details) - USD ($)
Oct. 30, 2021
Jul. 31, 2021
Oct. 19, 2018
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity $ 2,094,000,000    
Notes payable 2,376,000,000 $ 2,175,000,000  
Debt issuance costs, net 32,000,000 $ 35,000,000  
Letter of credit      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity 118,000,000    
Line of credit | Revolving credit facility | ABL Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 2,100,000,000
Line of credit facility, maximum borrowing capacity, optional increase     $ 600,000,000
Remaining availability under ABL credit facility 1,066,000,000    
Line of credit | Revolving credit facility | ABL Credit Facility | Accounts receivable      
Debt Instrument [Line Items]      
Line of credit facility, borrowing base, eligibility percent     90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Credit card receivable      
Debt Instrument [Line Items]      
Line of credit facility, borrowing base, eligibility percent     90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Inventories      
Debt Instrument [Line Items]      
Line of credit facility, borrowing base, eligibility percent     90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | Pharmacy receivable      
Debt Instrument [Line Items]      
Line of credit facility, borrowing base, eligibility percent     90.00%
Line of credit | Revolving credit facility | ABL Credit Facility | United States      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity 2,050,000,000   $ 2,050,000,000
Line of credit facility, borrowing capacity, reserves 193,000,000    
Line of credit facility, current borrowing capacity 2,311,000,000    
Notes payable 910,000,000    
Debt issuance costs, net 7,000,000    
Letters of credit outstanding, amount 118,000,000    
Line of credit | Revolving credit facility | ABL Credit Facility | Canada      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity 50,000,000   50,000,000
Line of credit facility, borrowing capacity, reserves 6,000,000    
Line of credit facility, current borrowing capacity 44,000,000    
Remaining availability under ABL credit facility 2,094,000,000    
Letters of credit outstanding, amount $ 0    
Line of credit | Letter of credit | ABL Credit Facility | United States      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     300,000,000
Line of credit | Letter of credit | ABL Credit Facility | Canada      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 25,000,000