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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 80,490 | $ 72,327 | $ 157,148 | $ 141,127
Net investment income (loss) | 146 | 289 | 314 | 586
Total revenues | 80,636 | 72,616 | 157,462 | 141,713
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 51,326 | 45,932 | 98,816 | 88,884
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,736 | 5,254 | 11,049 | 9,896
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 21,260 | 18,983 | 42,891 | 37,943
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,168 | 2,158 | 4,392 | 4,404
Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,756 | 20,525 | 45,865 | 41,008
Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 42,812 | 38,314 | 82,273 | 74,635
Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,286 | 24,728 | 51,704 | 48,002
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,645 | 20,367 | 45,642 | 40,682
Net investment income (loss) | 88 | 137 | 177 | 285
Total revenues | 22,756 | 20,525 | 45,865 | 41,008
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 | 21,245 | 18,968 | 42,859 | 37,910
Operating Segments | Health Care Benefits | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,423 | 1,420 | 2,829 | 2,813
Operating Segments | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 39,859 | 35,745 | 76,055 | 69,058
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | 42,812 | 38,314 | 82,273 | 74,635
Operating Segments | Pharmacy Services | Pharmacy network |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,537 | 22,918 | 47,361 | 44,811
Operating Segments | Pharmacy Services | Mail choice |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,030 | 15,235 | 34,404 | 29,483
Operating Segments | Pharmacy Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 245 | 161 | 508 | 341
Operating Segments | Pharmacy Services | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,567 | 38,153 | 81,765 | 74,294
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 | 245 | 161 | 508 | 341
Operating Segments | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,952 | 16,185 | 35,386 | 31,325
Net investment income (loss) | (18) | 0 | (34) | 46
Total revenues | 26,286 | 24,728 | 51,704 | 48,002
Operating Segments | Retail/ LTC | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20,017 | 18,873 | 39,549 | 36,758
Operating Segments | Retail/ LTC | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,736 | 5,254 | 11,049 | 9,896
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 | 551 | 601 | 1,140 | 1,302
Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34 | 30 | 65 | 62
Net investment income (loss) | 76 | 152 | 171 | 255
Total revenues | 110 | 182 | 236 | 317
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 | 15 | 32 | 33
Corporate/ Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19 | 15 | 33 | 29
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | (11,328) | (11,133) | (22,616) | (22,249)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (11,258) | (11,094) | (22,498) | (22,168)
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 | $ (70) | $ (39) | $ (118) | $ (81)

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