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Business Acquisitions and Divestitures (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 09, 2020
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 10, 2020
Jul. 01, 2019
Apr. 01, 2019
Mar. 31, 2019
Mar. 31, 2017
Business Acquisition [Line Items]                      
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01            
Cumulative effect adjustment   $ 5,309,000,000   $ (1,792,000,000) $ 175,000,000 $ 5,309,000,000       $ 8,287,000,000  
Equity earnings and charges from investment in Change Healthcare Joint Venture       (43,000,000) $ (48,000,000) (36,000,000)          
Tax Receivable Agreement (“TRA”)                      
Business Acquisition [Line Items]                      
Percentage of net cash tax savings realized or deemed realized under TRA (percent)         85.00%            
Tax Receivable Agreement (“TRA”) | Change Healthcare | Other Segments [Member]                      
Business Acquisition [Line Items]                      
Noncurrent liability       0 $ 0            
Retained Earnings                      
Business Acquisition [Line Items]                      
Cumulative effect adjustment   13,022,000,000   $ 9,030,000,000 $ 8,202,000,000 13,022,000,000       12,409,000,000  
Opening retained earnings adjustments: adoption of new accounting standards                      
Business Acquisition [Line Items]                      
Cumulative effect adjustment   (13,000,000)       (13,000,000)       11,000,000  
Opening retained earnings adjustments: adoption of new accounting standards | Retained Earnings                      
Business Acquisition [Line Items]                      
Cumulative effect adjustment   (13,000,000)       (13,000,000)     $ 69,000,000 $ 11,000,000  
Separation of Change Healthcare JV                      
Business Acquisition [Line Items]                      
Shares distributed in split-off (in shares) 176,000,000                    
Shares of common stock exchanged (in shares) 15,400,000                    
Number of shares converted into per share converted (shares)             1        
Common stock, par value (in dollars per share)             $ 0.001        
Change Healthcare                      
Business Acquisition [Line Items]                      
Shares repurchased (in shares) 15,400,000                    
Gain from sale of equity method investment $ 414,000,000 414,000,000                  
Corporate Joint Venture                      
Business Acquisition [Line Items]                      
Ownership interest in Joint Venture (percent)                     70.00%
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee     $ 246,000,000                
Corporate Joint Venture | Transition Services Agreements (“TSA”)                      
Business Acquisition [Line Items]                      
Total fees charged under the TSA           22,000,000          
Corporate Joint Venture | Change Healthcare                      
Business Acquisition [Line Items]                      
Ownership interest in Joint Venture (percent)               58.50%      
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee           246,000,000          
Pre-tax other-than-temporary impairment     $ 1,200,000,000     1,200,000,000          
Gain from sale of equity method investment   $ 414,000,000       (414,000,000)          
Equity earnings and charges from investment in Change Healthcare Joint Venture           $ 119,000,000          
Corporate Joint Venture | Change Healthcare | Opening retained earnings adjustments: adoption of new accounting standards | ASU 2014-09 | Retained Earnings                      
Business Acquisition [Line Items]                      
Cumulative effect adjustment                 $ 80,000,000    
Corporate Joint Venture | Change Healthcare, Inc.                      
Business Acquisition [Line Items]                      
Ownership interest in Joint Venture (percent)                     30.00%