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Loan Sale and Servicing Activities and Variable Interest Entities (Principal Balance, Delinquent Loans (Loans 90 Days or More Past Due), and Net Charge-Offs Related to Serviced Loans) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Residential Mortgage [Member] |  |  |  |  |
Total principal balance | $ 47,765 |  | $ 47,765 |  | $ 49,323
Delinquent loans | 433 |  | 433 |  | 492
Net charge-offs | 2 | $ 13 | 10 | $ 24 |
Commercial Mortgages [Member] |  |  |  |  |
Total principal balance | 41,391 |  | 41,391 |  | 42,414
Delinquent loans | $ 100 |  | 100 |  | $ 64
Net charge-offs |  | $ 178 | $ 99 | $ 296 |

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- Definition Amount of credit loss after recoveries for transferred financial assets not recognized in the statement of financial position. + References No definition available. + Details
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- Definition This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days. + 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 (e)(4) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + 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=118948506&loc=d3e107314-111719 + Details
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- Details
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- Details
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