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