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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The following table sets forth the computation of basic and diluted earnings (loss) per share:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions, except per share data)2021202020212020
Numerator:
Net income (loss) attributable to Realogy Holdings shareholders$114 $98 $296 $(378)
Denominator:
Weighted average common shares outstanding (denominator for basic earnings (loss) per share calculation)116.6 115.4 116.3 115.2 
Dilutive effect of stock-based compensation3.7 1.3 3.9 — 
Dilutive effect of Exchangeable Senior Notes and warrants— — — — 
Weighted average common shares outstanding (denominator for diluted earnings (loss) per share calculation)120.3 116.7 120.2 115.2 
Earnings (loss) per share attributable to Realogy Holdings shareholders:
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)