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Mergers, Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2018
Dec. 20, 2018
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill $ 44,648 $ 44,505   $ 44,602
Evernorth        
Business Acquisition [Line Items]        
Goodwill 33,800      
U.S Group Disability and Life Insurance | Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash proceeds from sale of business 6,200      
Gain (loss) on sale of business, pre-tax 4,200      
Gain (loss) on sale of business, after-tax $ 3,200      
Express Scripts        
Business Acquisition [Line Items]        
Total merger consideration     $ 52,800  
Goodwill     38,400  
Revenues included in results from the date of acquisition   $ 2,600    
Express Scripts | Evernorth        
Business Acquisition [Line Items]        
Goodwill     $ 33,700