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FAIR VALUE - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021 | Apr. 27, 2021 | Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value | $ 102,000,000 | $ 68,000,000 |  |
Termination of put and call options |  | 377,000,000 |  |
Notes Payable To Banks And Commercial Paper |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long term and short term debt, combined amount | 3,000,000,000 | 3,500,000,000 |  |
Carrying Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt outstanding | 9,800,000,000 | 9,000,000,000 |  |
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Senior notes debt outstanding | 9,400,000,000 | 10,000,000,000 |  |
Kindred at Home |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Equity interest to be acquired per agreement (percent) |  |  | 60.00% |
Put option | Other long-term liabilities |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value of financial liability | 173,000,000 | 202,000,000 | $ 0 | $ 63,000,000
Call option | Other long-term assets |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value of financial asset | $ 13,000,000 | $ 13,000,000 | $ 0 | $ 440,000,000
Unobservable Inputs (Level 3) | Investments | Fair Value Risk |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Concentration risk (percent) | 0.60% |  |  |

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