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Mortgage Servicing Rights and Related Liabilities - UPB related to owned MSRs (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Owned Service Loans [Line Items] |  |
Fair Value | $ 2,663 | $ 3,496
Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 266,667 | 296,782
Fair Value | 2,663 | 3,496
Credit sensitive | Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 122,422 | 147,895
Fair Value | 1,206 | 1,613
Interest sensitive | Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 144,245 | 148,887
Fair Value | 1,457 | 1,883
Agency | Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 220,139 | 240,688
Fair Value | 2,234 | 2,944
Non-agency | Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 46,528 | 56,094
Fair Value | $ 429 | $ 552

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- Definition This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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