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Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 22, 2025 USD ($) | Jun. 30, 2025 client | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) claim | Sep. 30, 2024 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers |  |  | $ 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
Less: Net realized capital gains (losses) |  |  | (11) |  |  | 19 | (59) | (89)
Cost of products sold |  |  | 57,045 |  |  | 52,948 | 162,107 | 151,019
Health care costs |  |  | 32,020 |  |  | 29,922 | 92,472 | 85,578
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  | 500 |  |  | 507 | 1,493 | 1,522
Net realized capital losses (gains) |  |  | 11 |  |  | (19) | 59 | 89
Acquisition-related transaction and integration costs |  |  | 27 |  |  | 41 | 100 | 203
Goodwill impairment |  |  | 5,725 |  |  | 0 | 5,725 | 0
Health Care Delivery clinic closure charge |  |  | 83 |  |  |  | 83 |
Litigation charges |  |  | 320 |  |  |  |  | 100
Office real estate optimization charges |  |  |  |  |  | 17 | 10 | 17
Restructuring charges |  |  | 0 |  |  | 1,169 | 0 | 1,169
Loss on Accountable Care assets |  |  |  |  |  |  | 288 |
Operating income (loss) |  |  | (3,207) |  |  | 832 | 2,548 | 6,148
Gain on deconsolidation of subsidiary | $ 483 |  | 483 |  |  | 0 | 483 | 0
Interest expense |  |  | (784) |  |  | (752) | (2,332) | (2,200)
Other income |  |  | 26 |  |  | 25 | 83 | 74
Income (loss) before income tax provision |  |  | (3,482) |  |  | 105 | 782 | 4,022
Depreciation and amortization |  |  | 1,134 |  |  | 1,161 | $ 3,459 | 3,450
Number of claims for which litigation charges were recorded | claim |  |  |  |  |  |  | 2 |
Opioid Litigation |  |  |  |  |  |  |  |
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Litigation charges |  |  |  |  |  |  | $ 320 |
Legacy Litigation |  |  |  |  |  |  |  |
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Litigation charges |  |  |  |  |  |  | 1,220 |
U.S. ex rel. Bassan et al. v. Omnicare, Inc. and CVS Health Corp. |  |  |  |  |  |  |  |
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Litigation charges |  |  |  | $ 542 | $ 387 |  |  |
United States Ex Rel. Behnke v. CVS Caremark Corporation, Et Al. |  |  |  |  |  |  |  |
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Litigation charges |  |  |  | $ 291 |  |  |  |
Number of clients | client |  | 2 |  |  |  |  |  |
Health Care Benefits |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers |  |  | 35,431 |  |  | 32,555 | 105,667 | 96,577
Net investment income (loss) |  |  | 513 |  |  | 423 | 1,307 | 1,076
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  | 0 |
Depreciation and amortization |  |  | 375 |  |  | 407 | 1,199 | 1,196
Health Services |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers |  |  | 42,354 |  |  | 40,794 | 120,568 | 115,954
Net investment income (loss) |  |  | (1) |  |  | (1) | 10 | (3)
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  | 5,725 |
Loss on Accountable Care assets |  |  |  |  |  |  | 288 |
Depreciation and amortization |  |  | 260 |  |  | 267 | 781 | 792
Pharmacy & Consumer Wellness |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers |  |  | 24,441 |  |  | 21,515 | 68,460 | 61,127
Net investment income (loss) |  |  | 0 |  |  | 0 | 0 | 0
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  | 0 |
Depreciation and amortization |  |  | 396 |  |  | 387 | 1,169 | 1,164
Corporate/ Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers |  |  | 13 |  |  | 14 | 40 | 43
Net investment income (loss) |  |  | 120 |  |  | 128 | 322 | 325
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | 103 |  |  | 100 | 310 | 298
Intersegment Eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | 0 |  |  | 0 | 0 | 0
Total revenues |  |  | (18,735) |  |  | (14,262) | (51,937) | (40,547)
Intersegment Eliminations | Health Care Benefits |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | (49) |  |  | (18) | (87) | (54)
Intersegment Eliminations | Health Services |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | (6,913) |  |  | (3,336) | (18,603) | (10,634)
Intersegment Eliminations | Pharmacy & Consumer Wellness |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | (11,773) |  |  | (10,908) | (33,247) | (29,859)
Operating Segments and Corporate/ Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total revenues |  |  | 121,606 |  |  | 109,690 | 348,311 | 315,646
Adjusted operating income (loss) |  |  | 3,459 |  |  | 2,547 | 11,846 | 9,248
Operating Segments | Health Care Benefits |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | 513 |  |  | 423 | 1,307 | 1,076
Total revenues |  |  | 35,993 |  |  | 32,996 | 107,061 | 97,707
Less: Net realized capital gains (losses) |  |  | 33 |  |  | (1) | (1) | (82)
Cost of products sold |  |  | 0 |  |  | 0 | 0 | 0
Health care costs |  |  | 31,319 |  |  | 29,443 | 90,696 | 84,359
Other segment items |  |  | 4,327 |  |  | 4,478 | 12,751 | 12,684
Adjusted operating income (loss) |  |  | 314 |  |  | (924) | 3,615 | 746
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Net realized capital losses (gains) |  |  | (33) |  |  | 1 | 1 | 82
Operating Segments | Health Services |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | (1) |  |  | (1) | 10 | (3)
Total revenues |  |  | 49,266 |  |  | 44,129 | 139,181 | 126,585
Less: Net realized capital gains (losses) |  |  | 0 |  |  | 0 | 15 | 0
Cost of products sold |  |  | 45,230 |  |  | 40,381 | 128,425 | 116,678
Health care costs |  |  | 1,291 |  |  | 936 | 3,439 | 2,428
Other segment items |  |  | 695 |  |  | 608 | 2,074 | 1,997
Adjusted operating income (loss) |  |  | 2,050 |  |  | 2,204 | 5,228 | 5,482
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Net realized capital losses (gains) |  |  | 0 |  |  | 0 | (15) | 0
Co-payments |  |  | 2,400 |  |  | 2,700 | 8,800 | 8,900
Operating Segments | Pharmacy & Consumer Wellness |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | 0 |  |  | 0 | 0 | 0
Total revenues |  |  | 36,214 |  |  | 32,423 | 101,707 | 90,986
Less: Net realized capital gains (losses) |  |  | 0 |  |  | 0 | 0 | 0
Cost of products sold |  |  | 29,647 |  |  | 26,032 | 83,005 | 72,627
Health care costs |  |  | 0 |  |  | 0 | 0 | 0
Other segment items |  |  | 5,089 |  |  | 4,795 | 14,573 | 14,343
Adjusted operating income (loss) |  |  | 1,478 |  |  | 1,596 | 4,129 | 4,016
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Net realized capital losses (gains) |  |  | 0 |  |  | 0 | 0 | 0
Corporate/ Other | Corporate/ Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net investment income (loss) |  |  | 120 |  |  | 128 | 322 | 325
Total revenues |  |  | 133 |  |  | 142 | 362 | 368
Less: Net realized capital gains (losses) |  |  | (44) |  |  | 20 | (73) | (7)
Cost of products sold |  |  | 0 |  |  | 0 | 0 | 0
Health care costs |  |  | 47 |  |  | 49 | 133 | 142
Other segment items |  |  | 513 |  |  | 402 | 1,428 | 1,229
Adjusted operating income (loss) |  |  | (383) |  |  | (329) | (1,126) | (996)
Reconciliation of principal measure of segment performance to consolidated operating loss: |  |  |  |  |  |  |  |
Net realized capital losses (gains) |  |  | $ 44 |  |  | $ (20) | $ 73 | $ 7

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