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Mergers, Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Apr. 19, 2021
Business Acquisition [Line Items]        
Goodwill $ 45,804   $ 45,811  
Acquired intangible assets 33,714   $ 34,102  
Integration and transaction-related costs (Selling, general and administrative expenses) 52 $ 29    
Integration and transaction-related costs, after-tax $ 37 $ 22    
MDLIVE, Inc.        
Business Acquisition [Line Items]        
Ownership interest acquired       97.00%
Ownership interest after acquisition       100.00%