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Pharmacies and Clinics Transactions - Schedule of Gain on Pharmacies and Clinics Transaction (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 16, 2015
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
May. 02, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
May. 03, 2014
Jan. 30, 2016
Jan. 31, 2015
Feb. 01, 2014
Dec. 31, 2015
Less:                          
Pretax gain on pharmacies and clinics transaction   $ 620 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 620 $ 0 $ 391  
Pharmacy and Clinic Business                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash consideration $ 1,868                       $ 1,900
Less:                          
Deferred income 694 $ 690               $ 690     $ 694
Inventory 447         $ 508         $ 508    
Other assets 13                        
Pretax transaction costs and contingent liabilities 94                        
Pretax gain on pharmacies and clinics transaction $ 620