Advances and Other Receivables, Net - Purchase Discount (Details) - USD ($) $ in Millions	5 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Servicing Advances
Balance - beginning of period	$ 246	$ 205
Addition from acquisition	0	19
Utilization of purchase discounts	(41)	(93)
Balance - end of period	205	131
Receivables from Agencies, Investors and Prior Servicers
Balance - beginning of period	56	48
Addition from acquisition	0	0
Utilization of purchase discounts	(8)	(27)
Balance - end of period	$ 48	$ 21