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Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 02, 2017
Jul. 18, 2017
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Aug. 01, 2017
Discontinued Operations Disclosures                    
Gain from sale of equity method investment, pre-tax             $ 43 $ 0 $ 0  
Distribution Solutions                    
Discontinued Operations Disclosures                    
Proceeds from sale of equity method investments   $ 42                
Gain from sale of equity method investment, pre-tax       $ 43            
Gain from sale of equity method investment, after tax       $ 26            
Distribution Solutions | ZEE Medical Business | Operating Segments                    
Discontinued Operations Disclosures                    
Pre-tax gain on sale of business         $ 52       52  
Gain from sale of business, after tax         29          
Proceeds from divestiture of businesses         $ 134          
Technology Solutions | Nurse Triage | Operating Segments                    
Discontinued Operations Disclosures                    
Pre-tax gain on sale of business           $ 51     $ 51  
Gain from sale of business, after tax           38        
Proceeds from divestiture of businesses           $ 84        
Disposal Group, Held-for-sale, Not Discontinued Operations | Enterprise Information Solutions                    
Discontinued Operations Disclosures                    
Consideration agreed upon for sale of business                   $ 185
Net cash proceeds received $ 169                  
Assumed net debt $ 16                  
Pre-tax gain on sale of business     $ 109              
Gain from sale of business, after tax     $ 30