Advances and Other Receivables, Net - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Servicing advances, net of $156 and $205 discount, respectively	$ 878		$ 1,000
Receivables from agencies, investors and prior servicers, net of $48 and $48 discount, respectively	220		241
Reserves	(98)		(47)
Total advances and other receivables, net	1,000		1,194
Servicing advances discount	156	$ 169	205
Receivables discount	$ 48	$ 48	$ 48