Advances and Other Receivables, Net - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2018
Receivables [Abstract]
Servicing advances, net of $131 and $205 discount, respectively	$ 970	$ 1,000
Receivables from agencies, investors and prior servicers, net of $21 and $48 discount, respectively	193	241
Reserves	(175)	(47)
Total advances and other receivables, net	988	1,194
Servicing advances discount	131	205	$ 246
Receivable discount	$ 21	$ 48	$ 56