Advances and Other Receivables, Net - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Servicing advances, net of $125 and $131 discount, respectively	$ 688	$ 970
Receivables from agencies, investors and prior servicers, net of $21 and $21 discount, respectively	190	193
Reserves	(193)	(175)
Total advances and other receivables, net	685	988
Servicing advances discount	125	131	$ 169	$ 205
Receivables discount	$ 21	$ 21	$ 48	$ 48