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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income (loss) attributable to Realogy Holdings and Realogy Group $ 149 $ (14) $ 182 $ (476)
Earnings Per Share, Basic and Diluted [Abstract]        
Weighted average common shares outstanding, Basic 116,500 115,400 116,200 115,000
Dilutive effect of stock-based compensation 2,800 0 3,200 0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 0 0 0 0
Weighted average common shares outstanding, Diluted 119,300 115,400 119,400 115,000
Basic earnings (loss) per share $ 1.28 $ (0.12) $ 1.57 $ (4.14)
Diluted earnings (loss) per share $ 1.25 $ (0.12) $ 1.52 $ (4.14)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,700   4,400