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BASIS OF PRESENTATION - Investments in Unconsolidated Affiliates (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 healthcare_facility | Sep. 30, 2025 hospital | Sep. 30, 2025 | Sep. 30, 2024 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investee results reflected (percent) |  |  |  |  |  | 1 |
Net operating revenues | $ 5,289 | $ 5,126 | $ 15,783 |  |  |  | $ 15,602
Net income | 579 | 681 | 1,723 |  |  |  | 3,492
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net operating revenues | 924 | 845 | 2,700 |  |  |  | 2,573
Net income | 247 | 212 | 692 |  |  |  | 677
Net income available to the investees | 133 | 112 | 382 |  |  |  | 388
Ambulatory Care |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of outpatient centers operated | hospital |  |  |  |  | 406 |  |
Number of outpatient centers | hospital |  |  |  |  | 556 |  |
Net operating revenues | $ 1,275 | $ 1,139 | $ 3,739 |  |  |  | $ 3,275
Ambulatory Care | United Surgical Partners International |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of outpatient centers recorded using equity method |  |  |  | 150 | 150 |  |

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