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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 87,983 | $ 84,944
Net investment income (loss) | 454 | 334
Total revenues | 88,437 | 85,278
Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 48,397 | 52,785
Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,370 | 5,597
Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 30,391 | 24,352
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,825 | 2,210
Operating Segments | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 31,865 | 25,692
Net investment income (loss) | 353 | 164
Total revenues | 32,236 | 25,877
Operating Segments | Health Care Benefits | Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Health Care Benefits | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Health Care Benefits | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 30,379 | 24,339
Operating Segments | Health Care Benefits | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,504 | 1,374
Operating Segments | Health Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 36,466 | 40,811
Net investment income (loss) | 0 | 0
Total revenues | 40,285 | 44,591
Operating Segments | Health Services | Pharmacy network |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 20,464 | 27,592
Operating Segments | Health Services | Mail & specialty |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 17,262 | 16,145
Operating Segments | Health Services | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 2,559 | 854
Operating Segments | Health Services | Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 37,726 | 43,737
Operating Segments | Health Services | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Health Services | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Health Services | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,559 | 854
Operating Segments | Pharmacy & Consumer Wellness |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 19,638 | 18,426
Net investment income (loss) | 0 | (3)
Total revenues | 28,725 | 27,922
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 22,784 | 21,780
Operating Segments | Pharmacy & Consumer Wellness | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,370 | 5,597
Operating Segments | Pharmacy & Consumer Wellness | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Pharmacy & Consumer Wellness | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 571 | 548
Corporate/ Other | Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 14 | 15
Net investment income (loss) | 101 | 173
Total revenues | 115 | 188
Corporate/ Other | Corporate/ Other | Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Corporate/ Other | Corporate/ Other | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Corporate/ Other | Corporate/ Other | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 12 | 13
Corporate/ Other | Corporate/ Other | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2 | 2
Intersegment Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Net investment income (loss) | 0 | 0
Total revenues | (12,924) | (13,300)
Intersegment Eliminations | Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (12,113) | (12,732)
Intersegment Eliminations | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ (811) | $ (568)

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