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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Principal value of variable rate long term debt | $ 1,886 |  |
Securitization obligations | $ 194 | $ 205 |
Company Owned Real Estate Brokerage Services | California |  |  |
Concentration risk, geographic area, revenue | 27.00% | 26.00% | 27.00%
Company Owned Real Estate Brokerage Services | New York |  |  |
Concentration risk, geographic area, revenue | 22.00% | 22.00% | 23.00%
Company Owned Real Estate Brokerage Services | Florida |  |  |
Concentration risk, geographic area, revenue | 9.00% | 9.00% | 10.00%
Minimum |  |  |
Fixed interest rate of swaps | 2.07% |  |
Maximum |  |  |
Fixed interest rate of swaps | 2.89% |  |
Interest rate swap contracts |  |  |
Notional value of derivative instrument | $ 1,475 |  |
Interest rate swap contracts | Not Designated as Hedging Instruments | Other non-current liabilities |  |  |
Fair value of interest rate derivative liabilities | $ 13 | $ 33 |

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