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Goodwill And Intangible Assets, Net Goodwill And Intangible Assets, Net (Narrative - Goodwill) (Details) (Technology Solutions [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Technology Solutions [Member]
   
Goodwill [Line Items]    
Accumulated goodwill impairment $ 36us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember
$ 36us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= mck_TechnologySolutionsMember