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Goodwill and Mortgage Servicing Rights (Mortgage Servicing Rights) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Mortgage servicing rights, beginning balance | $ 1,644 |
Mortgage servicing rights, ending balance | 1,067 |
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Mortgage servicing rights, beginning balance | 649 | $ 726
Mortgage servicing rights, ending balance | 490 | 630
Unpaid principal balance of loans serviced for others at end of period | 228,985 | 193,510
Servicing Advances | 285 | 204
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Time and Payoffs [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | (61) | (75)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Other [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | (166) | (88)
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | From loans sold with servicing retained [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | 45 | 16
Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Purchases [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | 23 | 51
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Mortgage servicing rights, beginning balance | 995 | 1,257
Mortgage servicing rights, ending balance | 577 | 997
Unpaid principal balance of loans serviced for others at end of period | 122,043 | 124,461
Servicing Advances | 92 | 128
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Time and Payoffs [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | (82) | (77)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Other [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Changes in Fair Value | (419) | (262)
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | From loans sold with servicing retained [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | 22 | 14
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Purchases [Member] |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Additions | $ 61 | $ 65

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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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Balance Type: | debit
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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://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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- Details
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- Details
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