Advances and Other Receivables, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Feb. 28, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables discount	$ 21		$ 21	$ 48		$ 48
Utilization of purchase discounts	175
Purchase discount, including servicing advances and receivables with imputed interest	146
Financing receivable, allowance for credit loss	$ 23
Financial instruments collection period	39 months
Pacific Union
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables discount					$ 19
WMIH Corp And Wand Merger Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables discount						$ 302
Advances and other receivables | Accounting Standards Update 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit loss	$ 6
Cumulative Effect, Period of Adoption, Adjustment | Advances and other receivables | Accounting Standards Update 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses		$ (7)