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Loans and Related Allowance for Credit Losses (Narrative) (Details) - USD ($) $ in Billions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Financing receivable and off-balance sheet, credit loss, allowance | $ 2.9 |
Nonperforming [Member] |  |
Troubled debt restructurings (TDRs) | 0.9 | $ 0.9
Performing, including Consumer Credit Card TDRs [Member] |  |
Troubled debt restructurings (TDRs) | 0.7 | 0.8
Federal Reserve Bank [Member] |  |
Loans pledged as collateral for the ability to borrow | 34.3 | 16.9
Federal Home Loan Bank [Member] |  |
Loans pledged as collateral for the ability to borrow | 70.2 | $ 68.0
Total commercial |  |
Increase (decrease) in commercial reserves | 2.1 |
Total consumer |  |
Increase (decrease) in consumer reserves | $ 0.8 |

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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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- Definition The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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