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Real Estate Transactions - 2019 Real Estate Investments (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 01, 2019 USD ($) property | Apr. 30, 2019 USD ($) property | Mar. 31, 2019 USD ($) facility | Dec. 31, 2018 USD ($) facility | Sep. 30, 2018 USD ($) facility | Jun. 30, 2018 USD ($) facility | Mar. 31, 2018 USD ($) | Dec. 31, 2018 property
Real Estate [Line Items] |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  |  | $ 21 |
Life science |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  |  |  | 4 |  |  |
Proceeds from Sale of Real Estate |  |  |  |  | $ 269 |  |  |
Life science | Life science facility |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 71 |  |  |  |  |
Life science | Land |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  | 1 | 1 |  |  |  |
Proceeds from Sale of Real Estate |  |  | $ 35 | $ 3 |  |  |  |
Payments to acquire real estate |  |  | $ 27 |  |  |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  | 2 |  |  | 2 |  |
Proceeds from Sale of Real Estate |  |  | $ 26 |  |  | $ 35 |  |
Subsequent Event | Senior Housing | Senior Housing |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 113 | $ 445 |  |  |  |  |  |
Number of properties acquired (in properties) | property | 3 | 9 |  |  |  |  |  |
Assets Leased to Others |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of assets transitioned | property |  |  |  |  |  |  |  | 37
Assets Leased to Others | Senior housing triple-net |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Number of assets transitioned | property | 4 |  |  |  |  |  |  | 17

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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