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Intangibles - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average remaining amortization period in years |  |  | 6 years | 5 years |
Weighted average remaining amortization period in years |  |  | 8 years | 8 years |
Goodwill |  |  | $ 18,000,000 | $ 18,000,000 |
Goodwill, impairment loss |  |  | 0 | 0 | $ 0
Held-for-sale |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  | 0 | 29,000,000 |
Goodwill, impairment loss | $ 22,000,000 | $ 7,000,000 | 29,000,000 |  |
Brookedale MTCA |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets acquired |  |  | 109,000,000 | 352,000,000 |
Intangible liabilities acquired |  |  | $ 57,000,000 | $ 83,000,000 |
Weighted average remaining amortization period in years |  |  | 9 years | 7 years |
Weighted average remaining amortization period in years |  |  |  | 9 years |

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