Advances and Other Receivables, Net - Purchase Discount (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Servicing Advances
Balance - beginning of period	$ 125	$ 169	$ 131	$ 205
Utilization of purchase discounts	(8)	(13)	(14)	(68)
Addition from acquisition			0	19
Balance - end of period	117	156	117	156
Receivables from Agencies, Investors and Prior Servicers
Balance - beginning of period	21	48	21	48
Utilization of purchase discounts	0	0	0	0
Addition from acquisition			0	0
Balance - end of period	$ 21	$ 48	$ 21	$ 48