v3.26.1
Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenues $ 105,455 $ 98,428 $ 205,307 $ 192,496
Net investment income (loss) 641 487 1,215 1,007
Total revenues 106,096 98,915 206,522 193,503
Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 60,826 55,349 117,765 107,856
Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 5,407 5,368 10,666 10,611
Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 35,117 34,195 68,908 67,015
Other        
Disaggregation of Revenue [Line Items]        
Revenues 4,105 3,516 7,968 7,014
Health Care Benefits        
Disaggregation of Revenue [Line Items]        
Revenues 36,999 35,831 72,476 70,236
Net investment income (loss) 508 407 970 794
Health Services        
Disaggregation of Revenue [Line Items]        
Revenues 45,389 40,118 87,998 78,214
Net investment income (loss) (1) (3) (1) 11
Pharmacy & Consumer Wellness        
Disaggregation of Revenue [Line Items]        
Revenues 23,054 22,466 44,806 44,019
Net investment income (loss) 0 0 0 0
Corporate/ Other        
Disaggregation of Revenue [Line Items]        
Revenues 13 13 27 27
Net investment income (loss) 134 83 246 202
Operating Segments | Health Care Benefits        
Disaggregation of Revenue [Line Items]        
Net investment income (loss) 508 407 970 794
Total revenues 37,538 36,258 73,509 71,068
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 35,119 34,184 68,911 66,992
Operating Segments | Health Care Benefits | Other        
Disaggregation of Revenue [Line Items]        
Revenues 1,911 1,667 3,628 3,282
Operating Segments | Health Services        
Disaggregation of Revenue [Line Items]        
Net investment income (loss) (1) (3) (1) 11
Total revenues 51,795 46,453 100,032 89,915
Operating Segments | Health Services | Pharmacy network        
Disaggregation of Revenue [Line Items]        
Total revenues 26,617 24,665 51,766 47,779
Operating Segments | Health Services | Mail & specialty        
Disaggregation of Revenue [Line Items]        
Total revenues 22,577 19,611 43,083 37,679
Operating Segments | Health Services | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 2,602 2,180 5,184 4,446
Operating Segments | Health Services | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 49,194 44,276 94,849 85,458
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 2,602 2,180 5,184 4,446
Operating Segments | Pharmacy & Consumer Wellness        
Disaggregation of Revenue [Line Items]        
Net investment income (loss) 0 0 0 0
Total revenues 33,816 33,581 65,805 65,493
Operating Segments | Pharmacy & Consumer Wellness | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 27,781 27,631 53,904 53,707
Operating Segments | Pharmacy & Consumer Wellness | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 5,407 5,368 10,666 10,611
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 628 582 1,235 1,175
Corporate/ Other | Corporate/ Other        
Disaggregation of Revenue [Line Items]        
Net investment income (loss) 134 83 246 202
Total revenues 147 96 273 229
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 23 23
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 (17,200) (17,473) (33,097) (33,202)
Intersegment Eliminations | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues (16,149) (16,558) (30,988) (31,309)
Intersegment Eliminations | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Intersegment Eliminations | Premiums        
Disaggregation of Revenue [Line Items]        
Revenues (13) 0 (26) 0
Intersegment Eliminations | Other        
Disaggregation of Revenue [Line Items]        
Revenues (1,038) (915) (2,083) (1,893)
Intersegment Eliminations | Health Care Benefits        
Disaggregation of Revenue [Line Items]        
Total revenues (31) (20) (63) (38)
Intersegment Eliminations | Health Services        
Disaggregation of Revenue [Line Items]        
Total revenues (6,407) (6,338) (12,035) (11,690)
Intersegment Eliminations | Pharmacy & Consumer Wellness        
Disaggregation of Revenue [Line Items]        
Total revenues $ (10,762) $ (11,115) $ (20,999) $ (21,474)