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Revenue Recognition Revenue Recognition - Deferred Revenue (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jan. 01, 2018
Deferred Revenue Arrangement [Line Items] |  |  |  |
Royalty Rate |  | 6.00% |  |
Deferred Revenue |  | $ 102 | $ 102 | $ 114
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period |  | 166 |  |
Recognized as Revenue during the period |  | (178) |  |
Ending Balance at September 30, 2018 |  | 102 |  |
Real Estate Franchise Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue | [1] | 74 | 74 | 79
Deferred Sales Commission |  |  | 24 | 24
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period | [1] | 88 |  |
Recognized as Revenue during the period | [1] | (93) |  |
Ending Balance at September 30, 2018 | [1] | 74 |  |
Real Estate Franchise Services | Brand Marketing Fees |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 8 | 8 | 13
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Ending Balance at September 30, 2018 |  | 8 |  |
Real Estate Franchise Services | Area Development Fees |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 55 | 55 | 58
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period | [1] | 1 |  |
Recognized as Revenue during the period |  | (4) |  |
Ending Balance at September 30, 2018 |  | 55 |  |
Company Owned Real Estate Brokerage Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 15 | 15 | 17
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period |  | 12 |  |
Recognized as Revenue during the period |  | (14) |  |
Ending Balance at September 30, 2018 |  | 15 |  |
Company Owned Real Estate Brokerage Services | New Development Business |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 10 | 10 | 10
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period |  | 5 |  |
Recognized as Revenue during the period |  | (5) |  |
Ending Balance at September 30, 2018 |  | 10 |  |
Relocation Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 13 | 13 | 18
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period |  | 66 |  |
Recognized as Revenue during the period |  | (71) |  |
Ending Balance at September 30, 2018 |  | 13 |  |
Relocation Services | Outsourcing Management Fees |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 5 | 5 | 5
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period |  | 48 |  |
Recognized as Revenue during the period |  | (48) |  |
Ending Balance at September 30, 2018 |  | 5 |  |
Relocation Services | Broker Network Fees |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Deferred Revenue |  | 3 | $ 3 | $ 8
Movement in Deferred Revenue [Roll Forward] |  |  |  |
Additions during the period |  | 2 |  |
Recognized as Revenue during the period |  | (7) |  |
Ending Balance at September 30, 2018 |  | $ 3 |  |
Minimum | Company Owned Real Estate Brokerage Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
New Development Period |  | 18 months |  |
Minimum | Relocation Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Average Length of a Move |  | 3 months |  |
Maximum | Company Owned Real Estate Brokerage Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
New Development Period |  | 24 months |  |
Maximum | Relocation Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Average Length of a Move |  | 6 months |  |
Franchise Rights | Real Estate Franchise Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Amortization period |  | 30 years |  |
International Franchise Rights | Real Estate Franchise Services |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |
Amortization period |  | 25 years |  |
[1] | Revenues recognized include intercompany marketing fees paid by the Company Owned Real Estate Brokerage Services segment.

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