v3.26.1
Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
claim
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
claim
Segment Reporting [Line Items]        
Revenues from external customers $ 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
Less: Net realized capital gains (losses) (13) (27) (29) (48)
Cost of products sold 58,862 54,005 114,306 105,062
Health care costs 31,485 31,317 60,843 60,452
Reconciliation of principal measure of segment performance to consolidated operating income:        
Amortization of intangible assets 431 494 873 993
Net realized capital losses 13 27 29 48
Acquisition-related integration costs 10 28 22 73
Legacy litigation charges   833   1,220
Loss on Accountable Care assets   41   288
Office real estate optimization charges   4   10
Operating income 4,703 2,381 9,383 5,755
Interest expense (757) (763) (1,531) (1,548)
Other income 31 29 63 57
Income before income tax provision 3,977 1,647 7,915 4,264
Depreciation and amortization 1,126 $ 1,171 2,241 $ 2,325
Number of claims for which litigation charges were recorded | claim   2   2
Health Care Benefits        
Segment Reporting [Line Items]        
Revenues from external customers 36,999 $ 35,831 72,476 $ 70,236
Net investment income (loss) 508 407 970 794
Reconciliation of principal measure of segment performance to consolidated operating income:        
Depreciation and amortization 348 419 688 824
Health Services        
Segment Reporting [Line Items]        
Revenues from external customers 45,389 40,118 87,998 78,214
Net investment income (loss) (1) (3) (1) 11
Reconciliation of principal measure of segment performance to consolidated operating income:        
Loss on Accountable Care assets   41   288
Depreciation and amortization 251 260 509 521
Pharmacy & Consumer Wellness        
Segment Reporting [Line Items]        
Revenues from external customers 23,054 22,466 44,806 44,019
Net investment income (loss) 0 0 0 0
Reconciliation of principal measure of segment performance to consolidated operating income:        
Depreciation and amortization 415 389 821 773
Corporate/ Other        
Segment Reporting [Line Items]        
Revenues from external customers 13 13 27 27
Net investment income (loss) 134 83 246 202
Reconciliation of principal measure of segment performance to consolidated operating income:        
Depreciation and amortization 112 103 223 207
Intersegment Eliminations        
Segment Reporting [Line Items]        
Net investment income (loss) 0 0 0 0
Total revenues (17,200) (17,473) (33,097) (33,202)
Intersegment Eliminations | Health Care Benefits        
Segment Reporting [Line Items]        
Total revenues (31) (20) (63) (38)
Intersegment Eliminations | Health Services        
Segment Reporting [Line Items]        
Total revenues (6,407) (6,338) (12,035) (11,690)
Intersegment Eliminations | Pharmacy & Consumer Wellness        
Segment Reporting [Line Items]        
Total revenues (10,762) (11,115) (20,999) (21,474)
Operating Segments and Corporate/ Other        
Segment Reporting [Line Items]        
Total revenues 123,296 116,388 239,619 226,705
Adjusted operating income (loss) 5,157 3,808 10,307 8,387
Operating Segments | Health Care Benefits        
Segment Reporting [Line Items]        
Net investment income (loss) 508 407 970 794
Total revenues 37,538 36,258 73,509 71,068
Less: Net realized capital gains (losses) 2 (13) 3 (34)
Cost of products sold 0 0 0 0
Health care costs 30,692 30,740 59,271 59,377
Operating expenses, excluding other segment items 4,418 4,223 8,768 8,424
Adjusted operating income (loss) 2,426 1,308 5,467 3,301
Reconciliation of principal measure of segment performance to consolidated operating income:        
Net realized capital losses (2) 13 (3) 34
Operating Segments | Health Services        
Segment Reporting [Line Items]        
Net investment income (loss) (1) (3) (1) 11
Total revenues 51,795 46,453 100,032 89,915
Less: Net realized capital gains (losses) 0 0 0 15
Cost of products sold 47,908 43,080 92,627 83,195
Health care costs 1,350 1,101 2,652 2,148
Operating expenses, excluding other segment items 804 697 1,531 1,379
Adjusted operating income (loss) 1,733 1,575 3,222 3,178
Reconciliation of principal measure of segment performance to consolidated operating income:        
Net realized capital losses 0 0 0 (15)
Co-payments 2,800 2,700 6,600 6,400
Operating Segments | Pharmacy & Consumer Wellness        
Segment Reporting [Line Items]        
Net investment income (loss) 0 0 0 0
Total revenues 33,816 33,581 65,805 65,493
Less: Net realized capital gains (losses) 0 0 0 0
Cost of products sold 27,282 27,554 53,072 53,358
Health care costs 0 0 0 0
Operating expenses, excluding other segment items 5,059 4,689 10,061 9,484
Adjusted operating income (loss) 1,475 1,338 2,672 2,651
Reconciliation of principal measure of segment performance to consolidated operating income:        
Net realized capital losses 0 0 0 0
Corporate/ Other | Corporate/ Other        
Segment Reporting [Line Items]        
Net investment income (loss) 134 83 246 202
Total revenues 147 96 273 229
Less: Net realized capital gains (losses) (15) (14) (32) (29)
Cost of products sold 0 0 0 0
Health care costs 44 40 90 86
Operating expenses, excluding other segment items 595 483 1,269 915
Adjusted operating income (loss) (477) (413) (1,054) (743)
Reconciliation of principal measure of segment performance to consolidated operating income:        
Net realized capital losses $ 15 $ 14 $ 32 $ 29