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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 |  |  |  |  |

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