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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income (loss) attributable to Realogy Holdings and Realogy Group $ 114 $ 98 $ 296 $ (378)
Earnings Per Share, Basic and Diluted [Abstract]        
Weighted average common shares outstanding, Basic 116,600 115,400 116,300 115,200
Dilutive effect of stock-based compensation 3,700 1,300 3,900 0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 0 0 0 0
Weighted average common shares outstanding, Diluted 120,300 116,700 120,200 115,200
Basic earnings (loss) per share $ 0.98 $ 0.85 $ 2.55 $ (3.28)
Diluted earnings (loss) per share $ 0.95 $ 0.84 $ 2.46 $ (3.28)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,800 8,300 3,600