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Business Combinations Acquired Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 5,761 $ 660
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years 8 years
Change Healthcare    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 4,050  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years  
Other Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 1,711  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years  
Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 5,761  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years  
Customer-Related Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 3,927 $ 484
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years 9 years
Customer-Related Intangible Assets [Member] | Change Healthcare    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 3,063  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years  
Customer-Related Intangible Assets [Member] | Other Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 864  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years  
Customer-Related Intangible Assets [Member] | Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 3,927  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years  
Trademarks and Technology [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 1,058 $ 147
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years 5 years
Trademarks and Technology [Member] | Change Healthcare    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 977  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years  
Trademarks and Technology [Member] | Other Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 81  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years  
Trademarks and Technology [Member] | Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 1,058  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years  
Other Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 776 $ 29
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years 11 years
Other Intangible Assets [Member] | Change Healthcare    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 10  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 1 year  
Other Intangible Assets [Member] | Other Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 766  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years  
Other Intangible Assets [Member] | Acquisitions    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 776  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years