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FAIR VALUE - Narrative (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Aug. 11, 2022 | Apr. 27, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Asset value | $ 101,000,000 | $ 68,000,000 |  |  |  | $ 0
Termination of put and call options |  | $ 377,000,000 |  |  |  |
Disposed of by sale | Kindred at Home, Hospice and Personal Care Divisions |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Equity interest to be sold |  |  | 60.00% |  |  |
Fair Value Risk | Unobservable Inputs (Level 3) | Investments |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Concentration risk (percent) | 0.50% | 0.40% |  |  |  |
Put option |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of financial liability | $ 267,000,000 | $ 202,000,000 |  |  |  |
Call option |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of financial asset | 10,000,000 | 13,000,000 |  |  |  |
Other long-term liabilities | Put option |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of financial liability |  |  |  | $ 0 | $ 63,000,000 |
Other long-term assets | Call option |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Fair value of financial asset |  |  |  | $ 0 | $ 440,000,000 |
Kindred at Home |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Equity interest to be acquired per agreement (percent) |  |  |  | 60.00% |  |
Term Loan And Commercial Paper |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Short-term debt | 1,100,000,000 | 3,500,000,000 |  |  |  |
Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt outstanding | 10,000,000,000 | 9,000,000,000 |  |  |  |
Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt outstanding | $ 9,400,000,000 | $ 10,000,000,000 |  |  |  |

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