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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 102,239 | $ 94,878 | $ 294,735 | $ 273,701
Net investment income (loss) | 632 | 550 | 1,639 | 1,398
Total revenues | 102,871 | 95,428 | 296,374 | 275,099
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 59,548 | 54,659 | 167,404 | 154,036
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,192 | 5,196 | 15,803 | 15,847
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,719 | 30,925 | 100,734 | 91,983
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,780 | 4,098 | 10,794 | 11,835
Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,431 | 32,555 | 105,667 | 96,577
Net investment income (loss) | 513 | 423 | 1,307 | 1,076
Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 42,354 | 40,794 | 120,568 | 115,954
Net investment income (loss) | (1) | (1) | 10 | (3)
Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 24,441 | 21,515 | 68,460 | 61,127
Net investment income (loss) | 0 | 0 | 0 | 0
Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13 | 14 | 40 | 43
Net investment income (loss) | 120 | 128 | 322 | 325
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 513 | 423 | 1,307 | 1,076
Total revenues | 35,993 | 32,996 | 107,061 | 97,707
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 | 33,739 | 30,914 | 100,731 | 91,947
Operating Segments | Health Care Benefits | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,741 | 1,659 | 5,023 | 4,684
Operating Segments | Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | (1) | (1) | 10 | (3)
Total revenues | 49,266 | 44,129 | 139,181 | 126,585
Operating Segments | Health Services | Pharmacy network |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,408 | 24,136 | 74,187 | 66,448
Operating Segments | Health Services | Mail & specialty |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 20,392 | 17,214 | 58,071 | 52,127
Operating Segments | Health Services | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,467 | 2,780 | 6,913 | 8,013
Operating Segments | Health Services | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 46,800 | 41,350 | 132,258 | 118,575
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 | 2,467 | 2,780 | 6,913 | 8,013
Operating Segments | Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | 36,214 | 32,423 | 101,707 | 90,986
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,428 | 26,666 | 84,135 | 73,463
Operating Segments | Pharmacy & Consumer Wellness | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,192 | 5,196 | 15,803 | 15,847
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 | 594 | 561 | 1,769 | 1,676
Corporate/ Other | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 120 | 128 | 322 | 325
Total revenues | 133 | 142 | 362 | 368
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 | 11 | 34 | 36
Corporate/ Other | Corporate/ Other | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2 | 3 | 6 | 7
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income (loss) | 0 | 0 | 0 | 0
Total revenues | (18,735) | (14,262) | (51,937) | (40,547)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (17,680) | (13,357) | (48,989) | (38,002)
Intersegment Eliminations | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (31) | 0 | (31) | 0
Intersegment Eliminations | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (1,024) | (905) | (2,917) | (2,545)
Intersegment Eliminations | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (49) | (18) | (87) | (54)
Intersegment Eliminations | Health Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | (6,913) | (3,336) | (18,603) | (10,634)
Intersegment Eliminations | Pharmacy & Consumer Wellness |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ (11,773) | $ (10,908) | $ (33,247) | $ (29,859)

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