Advances and Other Receivables, Net - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 31, 2018
Receivables [Abstract]
Servicing advances, net of $148 and $205 discount, respectively	$ 865		$ 1,000
Receivables from agencies, investors and prior servicers, net of $48 and $48 discount, respectively	232		241
Reserves	(130)		(47)
Total advances and other receivables, net	967		1,194
Servicing advances discount	148	$ 156	205	$ 227	$ 246
Receivables discount	$ 48	$ 48	$ 48	$ 56	$ 56