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Pharmacies and Clinics Transactions - Schedule of Pharmacy and Clinic Inventory and Other Assets (Details) - USD ($)
$ in Millions
Jan. 30, 2016
Dec. 16, 2015
Jan. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Other current assets $ 0   $ 510
Pharmacy and Clinic Business      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Inventory included in other current assets   $ 447 508
Other current assets     2
Other noncurrent assets     12
Total     $ 522