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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)

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