Intangibles - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining amortization period in years	6 years	6 years
Weighted average remaining amortization period, liabilities	8 years	8 years
Brookedale MTCA
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 4	$ 109
Intangible liabilities acquired	$ 5	$ 57
Weighted average remaining amortization period in years	9 years	9 years
Weighted average remaining amortization period, liabilities	12 years	9 years