Advances and Other Receivables, Net - Purchase Discount (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Servicing Advances
Balance - beginning of period	$ 131	$ 205
Addition from acquisition	0	19
Utilization of purchase discounts	(6)	(55)
Balance - end of period	125	169
Receivables from Agencies, Investors and Prior Servicers
Balance - beginning of period	21	48
Addition from acquisition	0	0
Utilization of purchase discounts	0	0
Balance - end of period	$ 21	$ 48