Advances and Other Receivables, Net - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing advances, net of $205 and $0 discount, respectively	$ 952
Receivables from agencies, investors and prior servicers, net of $48 and $0 discount, respectively	289
Reserves	(47)
Total advances and other receivables, net	1,194
Servicing advances discount	205	$ 246
Receivable discount	$ 48	$ 56
Predecessor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Servicing advances, net of $205 and $0 discount, respectively			$ 1,599
Receivables from agencies, investors and prior servicers, net of $48 and $0 discount, respectively			391
Reserves			(284)
Total advances and other receivables, net			1,706
Servicing advances discount			0
Receivable discount			$ 0