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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 98,428 | $ 90,840 | $ 192,496 | $ 178,823
Net investment income (loss) | 487 | 394 | 1,007 | 848
Total revenues | 98,915 | 91,234 | 193,503 | 179,671
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,349 | 50,980 | 107,856 | 99,377
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,368 | 5,281 | 10,611 | 10,651
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 34,195 | 30,667 | 67,015 | 61,058
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,516 | 3,912 | 7,014 | 7,737
Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,831 | 32,157 | 70,236 | 64,022
Net investment income (loss) | 407 | 300 | 794 | 653
Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,118 | 38,694 | 78,214 | 75,160
Net investment income (loss) | (3) | (2) | 11 | (2)
Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,466 | 19,974 | 44,019 | 39,612
Net investment income (loss) | 0 | 0 | 0 | 0
Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 15 | 27 | 29
Net investment income (loss) | 83 | 96 | 202 | 197
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 407 | 300 | 794 | 653
Total revenues | 36,258 | 32,475 | 71,068 | 64,711
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 | 34,184 | 30,654 | 66,992 | 61,033
Operating Segments | Health Care Benefits | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,667 | 1,521 | 3,282 | 3,025
Operating Segments | Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | (3) | (2) | 11 | (2)
Total revenues | 46,453 | 42,171 | 89,915 | 82,456
Operating Segments | Health Services | Pharmacy network |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,665 | 21,848 | 47,779 | 42,312
Operating Segments | Health Services | Mail & specialty |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 19,611 | 17,651 | 37,679 | 34,913
Operating Segments | Health Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,180 | 2,674 | 4,446 | 5,233
Operating Segments | Health Services | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 44,276 | 39,499 | 85,458 | 77,225
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 | 2,180 | 2,674 | 4,446 | 5,233
Operating Segments | Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | 33,581 | 29,838 | 65,493 | 58,563
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 27,631 | 24,013 | 53,707 | 46,797
Operating Segments | Pharmacy & Consumer Wellness | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,368 | 5,281 | 10,611 | 10,651
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 | 582 | 544 | 1,175 | 1,115
Corporate/ Other | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 83 | 96 | 202 | 197
Total revenues | 96 | 111 | 229 | 226
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 | 11 | 13 | 23 | 25
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 | (17,473) | (13,361) | (33,202) | (26,285)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (16,558) | (12,532) | (31,309) | (24,645)
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 | (915) | (829) | (1,893) | (1,640)
Intersegment Eliminations | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (20) | (18) | (38) | (36)
Intersegment Eliminations | Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (6,338) | (3,479) | (11,690) | (7,298)
Intersegment Eliminations | Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ (11,115) | $ (9,864) | $ (21,474) | $ (18,951)

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