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Goodwill and Other Intangible Assets, Schedule of Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2014
Aug. 31, 2014
Nov. 30, 2013
Goodwill [Roll Forward]      
Net book value - Beginning Period $ 2,359us-gaap_Goodwill $ 2,491us-gaap_Goodwill  
Sale of business   (92)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Acquisitions 0us-gaap_GoodwillAcquiredDuringPeriod    
Other (3)us-gaap_GoodwillOtherChanges [1] (40)us-gaap_GoodwillOtherChanges [1]  
Net book value - Ending Period 2,356us-gaap_Goodwill 2,359us-gaap_Goodwill  
Kerr Drug [Member]      
Goodwill [Roll Forward]      
Net book value - Beginning Period     42us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wag_KerrDrugMember
Net book value - Ending Period     $ 42us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wag_KerrDrugMember
[1] "Other" primarily represents immaterial purchase accounting adjustments for the Company's acquisitions. In November 2014, the Company finalized purchase accounting for the acquisition of Kerr Drug which it completed in November 2013 for $170 million. The Company recorded $42 million of goodwill and $54 million of intangible assets in conjunction with this acquisition.