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Mortgage Servicing Rights ("MSRs") and Related Liabilities - MSR's at Fair Value (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
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May 01, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Feb. 01, 2019
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Fair value - beginning of period |  |  | $ 3,665 |  |
Fair value - end of period |  | $ 3,505 | 3,505 |  |
Mortgage servicing rights |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Fair value - beginning of period |  |  | 3,665 | $ 2,937 |
Servicing retained from mortgage loans sold |  |  | 169 | 139 |
Purchases of servicing rights |  | 253 | 689 | 132 |
Sales of servicing assets |  |  | (294) | 4 |
Changes in valuation inputs or assumptions used in the valuation model |  |  | (542) | 283 |
Other changes in fair value |  |  | (182) | (139) |
Fair value - end of period |  | 3,505 | 3,505 | $ 3,356 |
Mortgage purchased under subservicing contract | $ 24,000 |  |  |  |
Pacific Union |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Mortgage servicing rights |  |  |  |  | $ 271
Pacific Union | Mortgage servicing rights |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Mortgage servicing rights |  | $ 271 | $ 271 |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Servicing Rights + References No definition available. + Details
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- Definition Servicing Asset at Fair Value, Additions, Servicing Retained From Mortgage Loans Sold + References No definition available. + Details
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- Definition The cash outflow used to purchase loans that are secured with real estate mortgage and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3461-108585 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + 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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(i) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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- Definition Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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- Definition Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(ii) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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