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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 94,878 | $ 89,487 | $ 273,701 | $ 263,078
Net investment income (loss) | 550 | 277 | 1,398 | 885
Total revenues | 95,428 | 89,764 | 275,099 | 263,963
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 54,659 | 56,198 | 154,036 | 164,045
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,196 | 5,371 | 15,847 | 16,597
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,925 | 24,657 | 91,983 | 74,117
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,098 | 3,261 | 11,835 | 8,319
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,555 | 26,089 | 96,577 | 78,302
Net investment income (loss) | 423 | 187 | 1,076 | 556
Total revenues | 32,996 | 26,296 | 97,707 | 78,920
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 | 30,914 | 24,645 | 91,947 | 74,079
Operating Segments | Health Care Benefits | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,659 | 1,464 | 4,684 | 4,285
Operating Segments | Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,794 | 44,064 | 115,954 | 127,907
Net investment income (loss) | (1) | 0 | (3) | 0
Total revenues | 44,129 | 46,891 | 126,585 | 137,697
Operating Segments | Health Services | Pharmacy network |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 24,136 | 27,981 | 66,448 | 83,050
Operating Segments | Health Services | Mail & specialty |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 17,214 | 17,004 | 52,127 | 50,378
Operating Segments | Health Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,780 | 1,906 | 8,013 | 4,269
Operating Segments | Health Services | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 41,350 | 44,985 | 118,575 | 133,428
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 | 2,780 | 1,906 | 8,013 | 4,269
Operating Segments | Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 21,515 | 19,321 | 61,127 | 56,826
Net investment income (loss) | 0 | (2) | 0 | (4)
Total revenues | 32,423 | 28,872 | 90,986 | 85,578
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26,666 | 22,977 | 73,463 | 67,371
Operating Segments | Pharmacy & Consumer Wellness | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,196 | 5,371 | 15,847 | 16,597
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 | 561 | 526 | 1,676 | 1,614
Corporate/ Other | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14 | 13 | 43 | 43
Net investment income (loss) | 128 | 92 | 325 | 333
Total revenues | 142 | 105 | 368 | 376
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 | 12 | 36 | 38
Corporate/ Other | Corporate/ Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3 | 1 | 7 | 5
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | (14,262) | (12,400) | (40,547) | (38,608)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (13,357) | (11,764) | (38,002) | (36,754)
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 | $ (905) | $ (636) | $ (2,545) | $ (1,854)

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