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Advances and Other Receivables - Purchase Discount (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Servicing Advances |  |  |  |
Balance - beginning of period | $ 31 | $ 117 | $ 72 | $ 131
Utilization of purchase discounts | (1) | (25) | (42) | (39)
Balance - end of period | 30 | 92 | 30 | 92
Receivables from Agencies, Investors and Prior Servicers |  |  |  |
Balance - beginning of period | 13 | 21 | 13 | 21
Utilization of purchase discounts | (7) | 0 | (8) | 0
Balance - end of period | 20 | 21 | 21 | 21
Advances And Other Receivables, Servicing Reserves, Write-Offs | $ 37 | $ 38 | $ 95 | $ 49
Document Quarterly Report |  |  | true |

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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 + Details
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