Transactions with Affiliates - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended							5 Months Ended	7 Months Ended	12 Months Ended
	Jul. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Related Party Transaction [Line Items]
Service related, net	$ 120	$ 259	$ 430	$ 258	$ 137	$ 84	$ 159	$ 317	$ 464	$ 418	$ 901	$ 909	$ 1,043
New Residential
Related Party Transaction [Line Items]
Payments for servicing fees											122		241
Revenue recognized for serving arrangements											3		6
Subsidiary of New Residential | Loan Subservicing Agreement | Agency MSRs
Related Party Transaction [Line Items]
Service related, net											$ 43		$ 31