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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 72,327 | $ 65,157 | $ 141,127 | $ 131,750
Net investment income | 289 | 184 | 586 | 346
Total revenues | 72,616 | 65,341 | 141,713 | 132,096
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45,932 | 41,774 | 88,884 | 83,646
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,254 | 4,653 | 9,896 | 9,861
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18,983 | 16,927 | 37,943 | 34,567
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,158 | 1,803 | 4,404 | 3,676
Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,525 | 18,468 | 41,008 | 37,666
Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 38,314 | 34,889 | 74,635 | 69,872
Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,728 | 21,662 | 48,002 | 44,411
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20,367 | 18,318 | 40,682 | 37,415
Net investment income | 137 | 127 | 285 | 220
Total revenues | 20,525 | 18,468 | 41,008 | 37,666
Operating Segments | Health Care Benefits | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Health Care Benefits | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Health Care Benefits | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18,968 | 16,913 | 37,910 | 34,534
Operating Segments | Health Care Benefits | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,420 | 1,428 | 2,813 | 2,912
Operating Segments | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,745 | 32,623 | 69,058 | 64,741
Net investment income | 0 | 0 | 0 | 0
Total revenues | 38,314 | 34,889 | 74,635 | 69,872
Operating Segments | Pharmacy Services | Pharmacy network |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,918 | 20,536 | 44,811 | 41,636
Operating Segments | Pharmacy Services | Mail choice |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 15,235 | 14,109 | 29,483 | 27,783
Operating Segments | Pharmacy Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 161 | 244 | 341 | 453
Operating Segments | Pharmacy Services | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 38,153 | 34,645 | 74,294 | 69,419
Operating Segments | Pharmacy Services | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Pharmacy Services | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Pharmacy Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 161 | 244 | 341 | 453
Operating Segments | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16,185 | 14,187 | 31,325 | 29,544
Net investment income | 0 | 0 | 46 | 0
Total revenues | 24,728 | 21,662 | 48,002 | 44,411
Operating Segments | Retail/ LTC | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 18,873 | 16,870 | 36,758 | 34,225
Operating Segments | Retail/ LTC | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,254 | 4,653 | 9,896 | 9,861
Operating Segments | Retail/ LTC | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Retail/ LTC | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 601 | 139 | 1,302 | 325
Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30 | 29 | 62 | 50
Net investment income | 152 | 57 | 255 | 126
Total revenues | 182 | 86 | 317 | 176
Corporate/ Other | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Corporate/ Other | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Corporate/ Other | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15 | 14 | 33 | 33
Corporate/ Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15 | 15 | 29 | 17
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income | 0 | 0 | 0 | 0
Total revenues | (11,133) | (9,764) | (22,249) | (20,029)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (11,094) | (9,741) | (22,168) | (19,998)
Intersegment Eliminations | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ (39) | $ (23) | $ (81) | $ (31)

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