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Mortgage Servicing Rights and Related Liabilities - UPB and Related Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Servicing Assets at Fair Value [Line Items] |  |
Mortgage servicing rights at fair value | $ 3,496 | $ 3,665
Mortgage Servicing Rights |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | 296,782 | 295,481
Mortgage servicing rights at fair value | 3,496 | 3,665
Mortgage Servicing Rights | Credit sensitive |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | 147,895 | 135,752
Mortgage servicing rights at fair value | 1,613 | 1,495
Mortgage Servicing Rights | Interest sensitive |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | 148,887 | 159,729
Mortgage servicing rights at fair value | $ 1,883 | $ 2,170

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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=118948506&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 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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