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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Principal value of variable rate long term debt | $ 2,058 |  |
Securitization obligations | $ 205 | $ 247 |
Company Owned Real Estate Brokerage Services | California [Member] |  |  |
Concentration risk, geographic area, revenue | 26.00% | 27.00% | 28.00%
Company Owned Real Estate Brokerage Services | New York [Member] |  |  |
Concentration risk, geographic area, revenue | 22.00% | 23.00% | 24.00%
Company Owned Real Estate Brokerage Services | Florida [Member] |  |  |
Concentration risk, geographic area, revenue | 9.00% | 10.00% | 10.00%
Minimum [Member] |  |  |
Fixed interest rate of swaps | 2.07% |  |
Maximum [Member] |  |  |
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 | 33 | $ 47 |
Foreign exchange contracts |  |  |
Notional value of derivative instrument | 29 | 33 |
Securitization obligations |  |  |
Securitization obligations | $ 205 | $ 247 |

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