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Variable Interest Entities and Investment in Unconsolidated Ventures - Equity Method Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Operations Information |  |  |
Resident fee revenue | $ 1,354 | $ 1,133 | $ 964
Facility operating expenses | (946) | (779) | (679)
Net income (loss) | (81) | (4) | $ (18)
Balance Sheet Information |  |  |
Current assets | 164 | 128 |
Noncurrent assets | 4,050 | 3,932 |
Current liabilities | 672 | 1,153 |
Noncurrent liabilities | $ 2,813 | $ 2,215 |

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