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Number Of Properties To Be Sold

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Total consideration, cash and noncash, received by seller for the sale of real estate.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The number of real estate properties owned as of the balance sheet date.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The percentage charged for managing real estate properties.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Master Transactions and Cooperation Agreement with Brookdale ("Brookdale Transaction") - Joint Venture Transactions (Details) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 01, 2017 USD ($) property agreement	Jan. 31, 2018 USD ($)	Dec. 31, 2017
RIDEA Facilities \| Assets Leased to Others \| Master Lease Transactions \| Affiliated Entity
Variable Interest Entity [Line Items]
Number of properties	58
SHOP \| RIDEA Facilities \| Assets Leased to Others \| Master Lease Transactions \| Affiliated Entity
Variable Interest Entity [Line Items]
Number of properties	36
Base management fee, percentage of gross revenue	5.00%
Percentage of annual increase in management fee	1.00%
Management fee annual rent increase period	2 years
Number of assets to be sold	4
Total consideration for disposition of real estate \| $	$ 239
Number of assets under management agreement	18
Number of management agreement with termination rights \| agreement	7
Management agreements with termination rights period	10 years
SHOP \| RIDEA Facilities \| Assets Leased to Others \| Master Lease Transactions \| Affiliated Entity \| Subsequent Event
Variable Interest Entity [Line Items]
Proceeds from sale of productive assets \| $		$ 27
CCRC JV
Variable Interest Entity [Line Items]
Investment ownership percentage			49.00%
CCRC JV \| SHOP \| Master Lease Transactions \| Affiliated Entity
Variable Interest Entity [Line Items]
Investment ownership percentage			49.00%
Ownership interest held by parent			51.00%
Maximum \| SHOP \| RIDEA Facilities \| Assets Leased to Others \| Master Lease Transactions \| Affiliated Entity
Variable Interest Entity [Line Items]
Base management fee, percentage of gross revenue	7.00%
RIDEA I
Variable Interest Entity [Line Items]
Ownership percentage (as a percent)			90.00%
RIDEA I \| Master Lease Transactions \| Affiliated Entity
Variable Interest Entity [Line Items]
Percentage of interest acquired	10.00%
Purchase price of acquisition \| $	$ 95