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Real Estate Transactions - Brookedale MTCA Transactions (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) property facility | Dec. 31, 2018 property | Jan. 01, 2018 USD ($) property
Real Estate [Line Items] |  |  |  |  |
Percentage of interest acquired |  |  | 10.00% |  |
Consideration transferred | $ |  |  | $ 95 |  |
Payment to acquired noncontrolling interest | $ | $ 63 | $ 32 |  |  |
Brookedale MTCA |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of assets to be sold (in properties) |  |  |  | 19 |
RIDEA Facilities |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Ownership percentage (as a percent) |  |  | 90.00% |  |
Assets Leased to Others |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of assets transitioned |  |  |  | 37 |
Assets Leased to Others | RIDEA Facilities |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Property count (in properties) |  |  | 58 |  |
Senior housing triple-net | Assets Leased to Others |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Property count (in properties) |  |  | 78 |  |
Disposition of properties, available for sale (in properties) |  |  | 32 |  |
Reduction in rent | $ |  |  |  |  | $ 5
Number of properties with rent concessions |  |  |  |  | 3
Total consideration for disposition of real estate | $ |  |  | $ 35 |  |
Number of assets transitioned |  |  |  | 17 |
Senior housing triple-net | Assets Leased to Others | Brookedale MTCA |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of properties acquired (in properties) | facility |  |  | 2 |  |
SHOP | Assets Leased to Others |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of assets transitioned |  |  |  | 20 |
SHOP | Assets Leased to Others | Brookedale MTCA |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Number of assets to be sold (in properties) |  |  | 4 |  |
SHOP | Assets Leased to Others | RIDEA Facilities |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Property count (in properties) |  |  | 36 |  |
Total consideration for disposition of real estate | $ |  |  | $ 240 |  |

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