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BASIS OF PRESENTATION - Goodwill (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, net of accumulated impairment losses | $ 10,691 |
Goodwill at end of period, net of accumulated impairment losses | 11,158 | $ 10,588
Hospital Operations: |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, net of accumulated impairment losses | 2,697 | 3,119
Goodwill acquired during the year, net of purchase price allocation adjustments | 0 | 42
Goodwill related to assets held for sale and disposed or deconsolidated facilities | 0 | (464)
Goodwill at end of period, net of accumulated impairment losses | 2,697 | 2,697
Ambulatory Care: |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of period, net of accumulated impairment losses | 7,994 | 7,188
Goodwill acquired during the year, net of purchase price allocation adjustments | 467 | 824
Goodwill related to assets held for sale and disposed or deconsolidated facilities | 0 | (121)
Goodwill at end of period, net of accumulated impairment losses | $ 8,461 | $ 7,891

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