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Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Revenues from external customers | $ 87,983 | $ 84,944
Net investment income (loss) | 454 | 334
Total revenues | 88,437 | 85,278
Adjusted operating income (loss) | 2,957 | 4,370
Operating Segments | Health Care Benefits |  |
Segment Reporting Information [Line Items] |  |
Revenues from external customers | 31,865 | 25,692
Net investment income (loss) | 353 | 164
Total revenues | 32,236 | 25,877
Adjusted operating income (loss) | 732 | 1,824
Operating Segments | Health Services |  |
Segment Reporting Information [Line Items] |  |
Revenues from external customers | 36,466 | 40,811
Net investment income (loss) | 0 | 0
Total revenues | 40,285 | 44,591
Adjusted operating income (loss) | 1,363 | 1,680
Co-payments | 3,400 | 4,100
Operating Segments | Pharmacy & Consumer Wellness |  |
Segment Reporting Information [Line Items] |  |
Revenues from external customers | 19,638 | 18,426
Net investment income (loss) | 0 | (3)
Total revenues | 28,725 | 27,922
Adjusted operating income (loss) | 1,177 | 1,134
Corporate/ Other | Corporate/ Other |  |
Segment Reporting Information [Line Items] |  |
Revenues from external customers | 14 | 15
Net investment income (loss) | 101 | 173
Total revenues | 115 | 188
Adjusted operating income (loss) | (315) | (268)
Intersegment Eliminations |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | (12,924) | (13,300)
Net investment income (loss) | 0 | 0
Total revenues | (12,924) | (13,300)
Adjusted operating income (loss) | 0 | 0
Intersegment Eliminations | Health Care Benefits |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | 18 | 21
Intersegment Eliminations | Health Services |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | 3,819 | 3,780
Intersegment Eliminations | Pharmacy & Consumer Wellness |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | $ 9,087 | $ 9,499

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