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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jan. 31, 2017
Accounting Policies [Abstract] |  |
Residency agreement term, minimum | 30 days |
Residency agreement term, maximum | 1 year |
Maximum period available for occupancy from cessation of significant construction activity | 1 year |
Maximum useful life of building and improvements | 60 years |
RIDEA II |  |
Schedule of Equity Method Investments |  |
Investment ownership percentage | 40.00% | 40.00%
Fair value of equity investment |  | $ 107
Equity method investments |  | $ 121
Pro Forma | Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 |  |
Schedule of Equity Method Investments |  |
Cumulative effect of change on beginning retained earnings | $ 30 |
Pro Forma | Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 | RIDEA II |  |
Schedule of Equity Method Investments |  |
Equity method investments | $ 91 |

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