Advances and Other Receivables, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables discount	$ 21	$ 21	$ 21		$ 21	$ 48	$ 48		$ 48
Utilization of purchase discounts	183	183
Purchase discount, including servicing advances and receivables with imputed interest	138	$ 138
Accounting standards update		us-gaap:AccountingStandardsUpdate201613Member
Financing receivable, allowance for credit loss	31	$ 31
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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit loss	8	$ 14
Financing receivable, allowance for credit loss	14	14
Purchase Discount
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 17	$ 17
Cumulative effect, period of adoption, adjustment | Advances and other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				$ 7