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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 90,840 | $ 88,647 | $ 178,823 | $ 173,591
Net investment income (loss) | 394 | 274 | 848 | 608
Total revenues | 91,234 | 88,921 | 179,671 | 174,199
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 50,980 | 55,062 | 99,377 | 107,847
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,281 | 5,629 | 10,651 | 11,226
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,667 | 25,108 | 61,058 | 49,460
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,912 | 2,848 | 7,737 | 5,058
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,157 | 26,521 | 64,022 | 52,213
Net investment income (loss) | 300 | 205 | 653 | 369
Total revenues | 32,475 | 26,747 | 64,711 | 52,624
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 | 30,654 | 25,095 | 61,033 | 49,434
Operating Segments | Health Care Benefits | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,521 | 1,447 | 3,025 | 2,821
Operating Segments | Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 38,694 | 43,032 | 75,160 | 83,843
Net investment income (loss) | (2) | 0 | (2) | 0
Total revenues | 42,171 | 46,215 | 82,456 | 90,806
Operating Segments | Health Services | Pharmacy network |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 21,848 | 27,477 | 42,312 | 55,069
Operating Segments | Health Services | Mail & specialty |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17,651 | 17,229 | 34,913 | 33,374
Operating Segments | Health Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,674 | 1,509 | 5,233 | 2,363
Operating Segments | Health Services | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 39,499 | 44,706 | 77,225 | 88,443
Operating Segments | Health Services | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Health Services | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Health Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,674 | 1,509 | 5,233 | 2,363
Operating Segments | Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19,974 | 19,079 | 39,612 | 37,505
Net investment income (loss) | 0 | 1 | 0 | (2)
Total revenues | 29,838 | 28,784 | 58,563 | 56,706
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,013 | 22,614 | 46,797 | 44,394
Operating Segments | Pharmacy & Consumer Wellness | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,281 | 5,629 | 10,651 | 11,226
Operating Segments | Pharmacy & Consumer Wellness | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Pharmacy & Consumer Wellness | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 544 | 540 | 1,115 | 1,088
Corporate/ Other | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 15 | 15 | 29 | 30
Net investment income (loss) | 96 | 68 | 197 | 241
Total revenues | 111 | 83 | 226 | 271
Corporate/ Other | Corporate/ Other | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Corporate/ Other | Corporate/ Other | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Corporate/ Other | Corporate/ Other | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 13 | 25 | 26
Corporate/ Other | Corporate/ Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2 | 2 | 4 | 4
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | (13,361) | (12,908) | (26,285) | (26,208)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (12,532) | (12,258) | (24,645) | (24,990)
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 | $ (829) | $ (650) | $ (1,640) | $ (1,218)

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