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Commitments (Other Commitments) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Commitments [Line Items] |  |
Commitments | $ 220,368,000,000 | $ 199,618,000,000
Liability related to investments in low income housing tax credits | 1,100,000,000 | 600,000,000
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitments | 207,821,000,000 | 185,589,000,000
Commitments to extend credit | Total commercial lending |  |
Other Commitments [Line Items] |  |
Commitments | 153,089,000,000 | 131,762,000,000
Commitments to extend credit | Home equity lines of credit |  |
Other Commitments [Line Items] |  |
Commitments | 16,626,000,000 | 16,803,000,000
Commitments to extend credit | Credit card |  |
Other Commitments [Line Items] |  |
Commitments | 31,019,000,000 | 30,862,000,000
Commitments to extend credit | Other |  |
Other Commitments [Line Items] |  |
Commitments | 7,087,000,000 | 6,162,000,000
Standby letters of credit |  |
Other Commitments [Line Items] |  |
Commitments | 9,053,000,000 | 9,843,000,000
Standby letters of credit | Remarketing Programs |  |
Other Commitments [Line Items] |  |
Commitments | 3,800,000,000 | 4,100,000,000
Reinsurance Agreements |  |
Other Commitments [Line Items] |  |
Commitments | 0 | 1,393,000,000
Standby bond purchase agreements |  |
Other Commitments [Line Items] |  |
Commitments | 1,448,000,000 | 1,295,000,000
Other commitments |  |
Other Commitments [Line Items] |  |
Commitments | $ 2,046,000,000 | $ 1,498,000,000

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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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- 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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