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Earnings Per Share Earnings (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Net income attributable to Realogy Holdings shareholders | $ | 123 |  |  | $ | 109 |  |  | $ | 56 |  |  | $ | 81 |
Basic weighted average shares | 126.5 |  |  | 137.6 |  |  | 128.4 |  |  | 138.6 |
Stock options, restricted stock units and performance share units (a) | 1.1 |  |  | 1.3 |  |  | 1.3 |  |  | 1.3 |
Weighted average diluted shares | 127.6 |  |  | 138.9 |  |  | 129.7 |  |  | 139.9 |
Earnings Per Share: |  |  |  |  |  |  |
Basic | $ | 0.97 |  |  | $ | 0.79 |  |  | $ | 0.44 |  |  | $ | 0.58 |
Diluted | $ | 0.96 |  |  | $ | 0.78 |  |  | $ | 0.43 |  |  | $ | 0.58 |
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(a) | The three and six months ended June 30, 2018 respectively exclude 7.3 million and 7.1 million shares of common stock issuable for incentive equity awards, which includes performance share units based on the achievement of target amounts, that are anti-dilutive to the diluted earnings per share computation. The three and six months ended June 30, 2017 both exclude 5.8 million shares of common stock issuable for incentive equity awards, which includes performance share units based on the achievement of target amounts, that are anti-dilutive to the diluted earnings per share computation.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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