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Mortgage Servicing Rights and Related Liabilities - UPB related to owned MSRs (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Owned Service Loans [Line Items] |  |  |
UPB | $ 277,975 | $ 296,782 |
Fair Value | 2,757 | 3,496 | $ 3,505
Mortgage servicing rights |  |  |
Owned Service Loans [Line Items] |  |  |
UPB | 277,975 | 296,782 |
Fair Value | 2,757 | 3,496 |
Credit sensitive | Mortgage servicing rights |  |  |
Owned Service Loans [Line Items] |  |  |
UPB | 131,105 | 147,895 |
Fair Value | 1,307 | 1,613 |
Interest sensitive | Mortgage servicing rights |  |  |
Owned Service Loans [Line Items] |  |  |
UPB | 146,870 | 148,887 |
Fair Value | 1,450 | 1,883 |
Agency | Mortgage servicing rights |  |  |
Owned Service Loans [Line Items] |  |  |
UPB | 228,680 | 240,688 |
Fair Value | 2,308 | 2,944 |
Non-agency | Mortgage servicing rights |  |  |
Owned Service Loans [Line Items] |  |  |
UPB | 49,295 | 56,094 |
Fair Value | $ 449 | $ 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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