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Equity Method Investment in Change Healthcare Joint Venture (Details) - USD ($)
3 Months Ended
Jul. 01, 2019
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Apr. 01, 2019
Mar. 31, 2019
Apr. 01, 2018
Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]                
Cumulative-effect adjustment to beginning retained earnings         $ 11,000,000   $ 154,000,000  
Net income (loss) from Change Healthcare     $ 4,000,000 $ (56,000,000)        
Carrying value of investment     3,617,000,000     $ 3,513,000,000    
Change Healthcare JV | Tax Receivable Agreement (“TRA”)                
Schedule of Equity Method Investments [Line Items]                
Noncurrent liability     0     0    
Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (percent)               70.00%
Carrying value of investment     3,617,000,000     3,513,000,000    
Excess of carrying amount over book value of investment     4,091,000,000     $ 4,158,000,000    
Change Healthcare JV | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Net income (loss) from Change Healthcare     $ 4,000,000 $ (56,000,000)        
Retained Earnings                
Schedule of Equity Method Investments [Line Items]                
Cumulative-effect adjustment to beginning retained earnings         11,000,000   $ 154,000,000  
Change Healthcare, Inc. | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (percent)               30.00%
Subsequent Event | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (percent) 58.50%              
Subsequent Event | Change Healthcare, Inc.                
Schedule of Equity Method Investments [Line Items]                
IPO cash proceeds $ 888,000,000              
Proceeds from concurrent offering of other securities $ 279,000,000              
Subsequent Event | Change Healthcare, Inc. | Change Healthcare JV                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (percent) 41.50%              
Contributions made in exchange of additional interest $ 609,000,000              
Expect | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Loss expected to be recognized   $ 246,000,000            
ASU 2014-09 | Retained Earnings | Change Healthcare JV | Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Cumulative-effect adjustment to beginning retained earnings         $ 80,000,000      
Initial public offering | Subsequent Event | Change Healthcare, Inc.                
Schedule of Equity Method Investments [Line Items]                
Offering price $ 13