v3.26.1
Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Revenues $ 99,852 $ 94,068
Net investment income 574 520
Total revenues 100,426 94,588
Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 56,939 52,507
Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 5,259 5,243
Premiums    
Disaggregation of Revenue [Line Items]    
Revenues 33,791 32,820
Other    
Disaggregation of Revenue [Line Items]    
Revenues 3,863 3,498
Health Care Benefits    
Disaggregation of Revenue [Line Items]    
Revenues 35,477 34,405
Net investment income 462 387
Health Services    
Disaggregation of Revenue [Line Items]    
Revenues 42,609 38,096
Net investment income 0 14
Pharmacy & Consumer Wellness    
Disaggregation of Revenue [Line Items]    
Revenues 21,752 21,553
Net investment income 0 0
Corporate/ Other    
Disaggregation of Revenue [Line Items]    
Revenues 14 14
Net investment income 112 119
Operating Segments | Health Care Benefits    
Disaggregation of Revenue [Line Items]    
Net investment income 462 387
Total revenues 35,971 34,810
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 33,792 32,808
Operating Segments | Health Care Benefits | Other    
Disaggregation of Revenue [Line Items]    
Revenues 1,717 1,615
Operating Segments | Health Services    
Disaggregation of Revenue [Line Items]    
Net investment income 0 14
Total revenues 48,237 43,462
Operating Segments | Health Services | Pharmacy network    
Disaggregation of Revenue [Line Items]    
Total revenues 25,149 23,114
Operating Segments | Health Services | Mail & specialty    
Disaggregation of Revenue [Line Items]    
Total revenues 20,506 18,068
Operating Segments | Health Services | Other    
Disaggregation of Revenue [Line Items]    
Total revenues 2,582 2,266
Operating Segments | Health Services | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 45,655 41,182
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 2,582 2,266
Operating Segments | Pharmacy & Consumer Wellness    
Disaggregation of Revenue [Line Items]    
Net investment income 0 0
Total revenues 31,989 31,912
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues 26,123 26,076
Operating Segments | Pharmacy & Consumer Wellness | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 5,259 5,243
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 607 593
Corporate/ Other | Corporate/ Other    
Disaggregation of Revenue [Line Items]    
Net investment income 112 119
Total revenues 126 133
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 12
Corporate/ Other | Corporate/ Other | Other    
Disaggregation of Revenue [Line Items]    
Revenues 2 2
Intersegment Eliminations    
Disaggregation of Revenue [Line Items]    
Net investment income 0 0
Total revenues (15,897) (15,729)
Intersegment Eliminations | Pharmacy    
Disaggregation of Revenue [Line Items]    
Revenues (14,839) (14,751)
Intersegment Eliminations | Front Store    
Disaggregation of Revenue [Line Items]    
Revenues 0 0
Intersegment Eliminations | Premiums    
Disaggregation of Revenue [Line Items]    
Revenues (13) 0
Intersegment Eliminations | Other    
Disaggregation of Revenue [Line Items]    
Revenues (1,045) (978)
Intersegment Eliminations | Health Care Benefits    
Disaggregation of Revenue [Line Items]    
Total revenues (32) (18)
Intersegment Eliminations | Health Services    
Disaggregation of Revenue [Line Items]    
Total revenues (5,628) (5,352)
Intersegment Eliminations | Pharmacy & Consumer Wellness    
Disaggregation of Revenue [Line Items]    
Total revenues $ (10,237) $ (10,359)