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Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenues from external customers $ 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
Adjusted operating income (loss) 2,547 4,456 9,248 13,307
Operating Segments | Health Care Benefits        
Segment Reporting Information [Line Items]        
Revenues from external customers 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
Adjusted operating income (loss) (924) 1,536 746 4,901
Operating Segments | Health Services        
Segment Reporting Information [Line Items]        
Revenues from external customers 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
Adjusted operating income (loss) 2,204 1,878 5,482 5,452
Co-payments 2,700 3,200 8,900 10,700
Operating Segments | Pharmacy & Consumer Wellness        
Segment Reporting Information [Line Items]        
Revenues from external customers 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
Adjusted operating income (loss) 1,596 1,389 4,016 3,936
Corporate/ Other | Corporate/ Other        
Segment Reporting Information [Line Items]        
Revenues from external customers 14 13 43 43
Net investment income (loss) 128 92 325 333
Total revenues 142 105 368 376
Adjusted operating income (loss) (329) (347) (996) (982)
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Intersegment revenues (14,262) (12,400) (40,547) (38,608)
Net investment income (loss) 0 0 0 0
Total revenues (14,262) (12,400) (40,547) (38,608)
Adjusted operating income (loss) 0 0 0 0
Intersegment Eliminations | Health Care Benefits        
Segment Reporting Information [Line Items]        
Intersegment revenues 18 20 54 62
Intersegment Eliminations | Health Services        
Segment Reporting Information [Line Items]        
Intersegment revenues 3,336 2,827 10,634 9,790
Intersegment Eliminations | Pharmacy & Consumer Wellness        
Segment Reporting Information [Line Items]        
Intersegment revenues $ 10,908 $ 9,553 $ 29,859 $ 28,756