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Mortgage Loans Held for Sale - Held For Sale (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans held for sale - UPB | $ 5,438 | $ 3,949 |
Mark-to-market adjustment | 282 | 128 |
Total mortgage loans held for sale | 5,720 | 4,077 | $ 1,631
UPB | 64 | 29 |
Fair Value | 54 | 22 |
Ginnie Mae Repurchased Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
UPB | $ 44 | $ 25 |

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- Definition Amount, before valuation allowance, of financing receivable classified as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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