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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenues $ 76,658 $ 68,800
Net investment income (loss) 168 297
Total revenues 76,826 69,097
Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 47,490 42,952
Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 5,313 4,642
Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 21,631 18,960
Other    
Disaggregation of Revenue [Line Items]    
Revenues 2,224 2,246
Health Care Benefits    
Disaggregation of Revenue [Line Items]    
Total revenues 23,109 20,483
Pharmacy Services    
Disaggregation of Revenue [Line Items]    
Total revenues 39,461 36,321
Retail/ LTC    
Disaggregation of Revenue [Line Items]    
Total revenues 25,418 23,274
Operating Segments | Health Care Benefits    
Disaggregation of Revenue [Line Items]    
Revenues 22,997 20,315
Net investment income (loss) 89 148
Total revenues 23,109 20,483
Operating Segments | Health Care Benefits | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Operating Segments | Health Care Benefits | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Operating Segments | Health Care Benefits | Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 21,614 18,942
Operating Segments | Health Care Benefits | Other    
Disaggregation of Revenue [Line Items]    
Revenues 1,406 1,393
Operating Segments | Pharmacy Services    
Disaggregation of Revenue [Line Items]    
Revenues 36,196 33,313
Net investment income (loss) 0 0
Total revenues 39,461 36,321
Operating Segments | Pharmacy Services | Pharmacy network    
Disaggregation of Revenue [Line Items]    
Total revenues 22,824 21,893
Operating Segments | Pharmacy Services | Mail choice    
Disaggregation of Revenue [Line Items]    
Total revenues 16,374 14,248
Operating Segments | Pharmacy Services | Other    
Disaggregation of Revenue [Line Items]    
Total revenues 263 180
Operating Segments | Pharmacy Services | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 39,198 36,141
Operating Segments | Pharmacy Services | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Operating Segments | Pharmacy Services | Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Operating Segments | Pharmacy Services | Other    
Disaggregation of Revenue [Line Items]    
Revenues 263 180
Operating Segments | Retail/ LTC    
Disaggregation of Revenue [Line Items]    
Revenues 17,434 15,140
Net investment income (loss) (16) 46
Total revenues 25,418 23,274
Operating Segments | Retail/ LTC | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 19,532 17,885
Operating Segments | Retail/ LTC | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 5,313 4,642
Operating Segments | Retail/ LTC | Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Operating Segments | Retail/ LTC | Other    
Disaggregation of Revenue [Line Items]    
Revenues 589 701
Corporate/ Other    
Disaggregation of Revenue [Line Items]    
Revenues 31 32
Net investment income (loss) 95 103
Total revenues 126 135
Corporate/ Other | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Corporate/ Other | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Corporate/ Other | Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 17 18
Corporate/ Other | Other    
Disaggregation of Revenue [Line Items]    
Revenues 14 14
Intersegment Eliminations    
Disaggregation of Revenue [Line Items]    
Net investment income (loss) 0 0
Total revenues (11,288) (11,116)
Intersegment Eliminations | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues (11,240) (11,074)
Intersegment Eliminations | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Intersegment Eliminations | Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Intersegment Eliminations | Other    
Disaggregation of Revenue [Line Items]    
Revenues $ (48) $ (42)