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Business Acquisitions and Divestitures - Identified Assets Acquired and Liabilities Assumed (Rx Savings Solutions) (Details) - USD ($)
$ in Millions
Nov. 01, 2022
Dec. 31, 2022
Mar. 31, 2022
Business Acquisition, Contingent Consideration [Line Items]      
Goodwill   $ 9,934 $ 9,451
Rx Savings Solutions, LLC | RxTs Segment      
Business Acquisition, Contingent Consideration [Line Items]      
Cash $ 600    
Contingent consideration 92    
Total purchase consideration 692    
Current assets 6    
Intangible assets 229    
Other non-current assets 3    
Current liabilities (9)    
Total identifiable net assets 229    
Goodwill 463    
Net assets acquired $ 692