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Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Revenues from external customers $ 76,658 $ 68,800
Net investment income (loss) 168 297
Total revenues 76,826 69,097
Adjusted operating income (loss) 4,483 4,205
Health Care Benefits    
Segment Reporting Information [Line Items]    
Total revenues 23,109 20,483
Pharmacy Services    
Segment Reporting Information [Line Items]    
Total revenues 39,461 36,321
Retail/ LTC    
Segment Reporting Information [Line Items]    
Total revenues 25,418 23,274
Operating Segments | Health Care Benefits    
Segment Reporting Information [Line Items]    
Revenues from external customers 22,997 20,315
Net investment income (loss) 89 148
Total revenues 23,109 20,483
Adjusted operating income (loss) 1,751 1,782
Operating Segments | Pharmacy Services    
Segment Reporting Information [Line Items]    
Revenues from external customers 36,196 33,313
Net investment income (loss) 0 0
Total revenues 39,461 36,321
Adjusted operating income (loss) 1,636 1,507
Copayments 3,800 3,400
Operating Segments | Retail/ LTC    
Segment Reporting Information [Line Items]    
Revenues from external customers 17,434 15,140
Net investment income (loss) (16) 46
Total revenues 25,418 23,274
Adjusted operating income (loss) 1,605 1,394
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Revenues (11,288) (11,116)
Net investment income (loss) 0 0
Total revenues (11,288) (11,116)
Adjusted operating income (loss) (204) (175)
Intersegment Eliminations | Health Care Benefits    
Segment Reporting Information [Line Items]    
Revenues 23 20
Intersegment Eliminations | Pharmacy Services    
Segment Reporting Information [Line Items]    
Revenues 3,265 3,008
Intersegment Eliminations | Retail/ LTC    
Segment Reporting Information [Line Items]    
Revenues 8,000 8,088
Corporate/ Other    
Segment Reporting Information [Line Items]    
Revenues from external customers 31 32
Net investment income (loss) 95 103
Total revenues 126 135
Adjusted operating income (loss) $ (305) $ (303)