Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (462)	$ (99)
Currency translation adjustment	(2)	1
Defined benefit pension plan—amortization of actuarial loss to periodic pension cost	1	1
Other comprehensive (loss) income, before tax	(1)	2
Income tax expense (benefit) related to items of other comprehensive income amounts	0	0
Other comprehensive (loss) income, net of tax	(1)	2
Comprehensive loss	(463)	(97)
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive loss attributable to Realogy Holdings and Realogy Group	$ (463)	$ (97)