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Proposed Healthcare Technology Net Asset Exchange (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Jun. 30, 2017
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Current assets held for sale $ 2,002 $ 2,002   $ 635
Current liabilities held for sale 694 694   $ 660
Core MTS Businesses | Held-for-sale, Not Discontinued Operations        
Schedule of Equity Method Investments [Line Items]        
Current assets held for sale 1,892 1,892    
Current liabilities held for sale 693 693    
New Company | Operating Expenses | Technology Solutions        
Schedule of Equity Method Investments [Line Items]        
Expenses associated with the formation of the joint venture 31 58    
New Company | Expected        
Schedule of Equity Method Investments [Line Items]        
Expected ownership interest in the joint venture (percent)     70.00%  
New Company        
Schedule of Equity Method Investments [Line Items]        
Debt financing commitments received 6,100 6,100    
Bridge loan $ 1,200 $ 1,200    
Change Healthcare | New Company | Expected        
Schedule of Equity Method Investments [Line Items]        
Expected ownership interest in the joint venture (percent)     30.00%