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Proposed Healthcare Technology Net Asset Exchange (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Legal and other consulting fees $ 4  
Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Debt financing commitments received $ 6,100  
Expected | Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Expected ownership interest in the joint venture (percent)   70.00%
Expected | Change Healthcare | Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Expected ownership interest in the joint venture (percent)   30.00%