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Commitments (Other Commitments) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Other Commitments [Line Items] |  |
Commitments | $ 205,526 | $ 199,618
Liability Related To Investments In Low Income Housing Tax Credits | 500 | 600
Commitments to extend credit [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 193,712 | 185,589
Commitments to extend credit [Member] | Total commercial |  |
Other Commitments [Line Items] |  |
Commitments | 137,164 | 131,762
Commitments to extend credit [Member] | Home Equity Line of Credit [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 17,089 | 16,803
Commitments to extend credit [Member] | Credit Card [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 32,253 | 30,862
Commitments to extend credit [Member] | Other [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 7,206 | 6,162
Standby letters of credit [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 9,149 | 9,843
Standby letters of credit [Member] | Remarketing Programs [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 3,900 | 4,100
Reinsurance Agreements [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 92 | 1,393
Reinsurance Agreements [Member] | Accidental Death and Dismemberment [Member] |  |
Other Commitments [Line Items] |  |
Maximum Exposure |  | 1,300
Reinsurance Agreements [Member] | Credit Life Accident and Health [Member] |  |
Other Commitments [Line Items] |  |
Maximum Exposure | 100 | 100
Standby bond purchase agreements [Member] |  |
Other Commitments [Line Items] |  |
Commitments | 1,450 | 1,295
Other commitments [Member] |  |
Other Commitments [Line Items] |  |
Commitments | $ 1,123 | $ 1,498

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- Definition Represents the liability related to investments in low income housing tax credits which is reflected in other liabilities on our Consolidated Balance Sheet. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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Balance Type: | credit
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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