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Healthcare Technology Net Asset Exchange (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 01, 2017
Schedule of Equity Method Investments [Line Items]                
Gain from Sale of Business   $ 109     $ 0 $ 109 $ 0  
Payments received on Healthcare Technology Net Asset Exchange           126 0  
Net losses from Change Healthcare   90     $ 0 271 $ 0  
Carrying value of investment   3,704   $ 4,063   3,704    
Tax Receivable Agreement (“TRA”) | Change Healthcare, LLC (“Change Healthcare”)                
Schedule of Equity Method Investments [Line Items]                
Noncurrent liability   90   136   90    
Joint Venture | Transition Services Agreements (“TSA”)                
Schedule of Equity Method Investments [Line Items]                
Reimbursements for transition services fees   22       69    
Receivables from joint venture   54       54    
Change Healthcare, LLC (“Change Healthcare”) | Core MTS Businesses | Operating Segments | Technology Solutions                
Schedule of Equity Method Investments [Line Items]                
Gain from Sale of Business     $ 37 3,947        
Gain from sale of business, after tax     $ 22 $ 3,018        
Payments received on Healthcare Technology Net Asset Exchange   126            
Change Healthcare, LLC (“Change Healthcare”) | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Expected ownership interest in the joint venture (percent)               70.00%
Net losses from Change Healthcare   90       271    
Carrying value of investment   3,704       3,704    
Excess of carrying value of investment over proportional share of book value   $ 4,526       $ 4,526    
Expected | Minimum | Change Healthcare, LLC (“Change Healthcare”) | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 70              
Expected | Maximum | Change Healthcare, LLC (“Change Healthcare”) | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 110