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Healthcare Technology Net Asset Exchange (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Net income (loss) from Change Healthcare $ (56) $ (120)    
Carrying value of investment 3,672     $ 3,728
Change Healthcare, LLC (“Change Healthcare”) | Tax Receivable Agreement (“TRA”)        
Schedule of Equity Method Investments [Line Items]        
Noncurrent liability $ 90      
Joint Venture | Core MTS Businesses        
Schedule of Equity Method Investments [Line Items]        
Expected ownership interest in the joint venture (percent) 70.00%      
Change Healthcare, LLC (“Change Healthcare”)        
Schedule of Equity Method Investments [Line Items]        
Net income (loss) recognized by Change Healthcare $ 5 59    
Change Healthcare, LLC (“Change Healthcare”) | Core MTS Businesses | Operating Segments | Other        
Schedule of Equity Method Investments [Line Items]        
Gain from sale of business, pre-tax   37 $ 3,947  
Gain from sale of business, after tax   $ 22 $ 3,018  
Change Healthcare, LLC (“Change Healthcare”) | Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Expected ownership interest in the joint venture (percent) 70.00% 70.00%    
Net income (loss) from Change Healthcare $ (56) $ (120)    
Carrying value of investment 3,672     3,728
Excess of carrying value of investment over proportional share of book value 4,422     4,472
Net income (loss) recognized by Change Healthcare 7 (84)    
Fair value adjustment of carrying value to initial fair value basis $ 61 $ 120    
Tax Receivable Agreement (“TRA”) | Change Healthcare, LLC (“Change Healthcare”)        
Schedule of Equity Method Investments [Line Items]        
Noncurrent liability       $ 90