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Mergers, Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Apr. 19, 2021
Business Acquisition [Line Items]            
Goodwill $ 45,810   $ 45,810   $ 45,811  
Acquired intangible assets 33,276   33,276   $ 34,102  
Integration and transaction-related costs (Selling, general and administrative expenses) 36 $ 16 88 $ 45    
Integration and transaction-related costs, after-tax $ 26 $ 14 $ 63 $ 36    
MDLIVE, Inc.            
Business Acquisition [Line Items]            
Ownership interest acquired           97.00%
Ownership interest after acquisition           100.00%