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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Mortgage servicing rights, beginning balance | $ 1,818 |
Mortgage servicing rights, ending balance | 2,208 |
Mortgage Servicing Rights | Commercial real estate |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Mortgage servicing rights, beginning balance | 740 | $ 569
Mortgage servicing rights, ending balance | 886 | 701
Unpaid principal balance of loans serviced for others at end of period | 278,040 | 256,198
Servicing advances | 442 | 447
Mortgage Servicing Rights | Commercial real estate | Time and Payoffs |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | (34) | (28)
Mortgage Servicing Rights | Commercial real estate | Other |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | 151 | 129
Mortgage Servicing Rights | Commercial real estate | From loans sold with servicing retained |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | 21 | 18
Mortgage Servicing Rights | Commercial real estate | Purchases |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | 8 | 13
Mortgage Servicing Rights | Residential mortgage loans held for sale |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Mortgage servicing rights, beginning balance | 1,078 | 673
Mortgage servicing rights, ending balance | 1,322 | 979
Unpaid principal balance of loans serviced for others at end of period | 134,515 | 117,287
Servicing advances | 144 | 126
Mortgage Servicing Rights | Residential mortgage loans held for sale | Time and Payoffs |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | (60) | (73)
Mortgage Servicing Rights | Residential mortgage loans held for sale | Other |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | 207 | 295
Mortgage Servicing Rights | Residential mortgage loans held for sale | From loans sold with servicing retained |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | 21 | 13
Mortgage Servicing Rights | Residential mortgage loans held for sale | Purchases |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | $ 76 | $ 71

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- Definition Represents outstanding balance of funds advanced (i) to investors for monthly collections of borrower principal and interest, (ii) for borrower draws on unused home equity lines of credit, and (iii) for collateral protection associated with the underlying mortgage collateral + References No definition available. + Details
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- Definition Unpaid principal balance of residential mortgage loans serviced for others at period end. + References No definition available. + 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=125521744&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 -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=125521744&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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- 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://www.xbrl.org/2009/role/commonPracticeRef -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=125521744&loc=d3e122625-111746 + Details
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