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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 |  |

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