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Mortgage Servicing Rights ("MSRs") and Related Liabilities - UPB related to owned MSRs (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Owned Service Loans [Line Items] |  |
Fair Value | $ 3,481 | $ 3,665
Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 303,692 | 295,481
Fair Value | 3,481 | 3,665
Credit sensitive | Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 153,565 | 135,752
Fair Value | 1,626 | 1,495
Interest sensitive | Mortgage servicing rights |  |
Owned Service Loans [Line Items] |  |
UPB | 150,127 | 159,729
Fair Value | $ 1,855 | $ 2,170

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- Definition Subserviced Loans [Line Items] + References No definition available. + Details
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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=109247956&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=68078379&loc=d3e122625-111746 + Details
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- Details
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