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Fair Value of Assets and Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | $ 55,872 | $ 57,269
Short-term financial assets: |  |
Interest-bearing deposits with banks | 13,451 | 8,351
Securities purchased under agreements to resell | 571 | 380
Trading securities | 1,035 | 1,176
Loans held for sale | 977 | 1,022
Securities available for sale at fair value | 8,388 | 8,047
Derivative assets | 479 | 765
Other assets: |  |
Total assets | 87,908 | 84,209
Liabilities: |  |
Trading Liabilities | 531 | 353
Short-term financial liabilities: |  |
Securities sold under agreements to repurchase | 1,350 | 1,187
Term borrowings: |  |
Other long term borrowings | 1,672 | 1,670
Gross amounts of recognized liabilities | 98 | 125
Total liabilities | 79,343 | 75,902
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock |  |
Term borrowings: |  |
Restricted investments | 32 | 61
Fair Value, Inputs, Level 3 | FRB Stock |  |
Term borrowings: |  |
Restricted investments | 203 | 202
Reported Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 55,872 | 57,269
Short-term financial assets: |  |
Interest-bearing deposits with banks | 13,451 | 8,351
Federal funds sold and securities purchased under agreements to resell | 51 | 65
Securities purchased under agreements to resell | 571 | 380
Total short-term financial assets | 14,073 | 8,796
Trading securities | 1,035 | 1,176
Loans held for sale | 973 | 1,022
Securities available for sale at fair value | 8,388 | 8,047
Derivative assets | 480 | 769
Other assets: |  |
Tax credit investments | 419 | 400
Deferred compensation assets | 122 | 118
Equity, mutual funds, and other | 264 | 288
Total other assets | 805 | 806
Total assets | 81,626 | 77,885
Liabilities: |  |
Defined maturity | 4,304 | 5,070
Trading Liabilities | 531 | 353
Short-term financial liabilities: |  |
Federal funds purchased | 777 | 845
Securities sold under agreements to repurchase | 1,350 | 1,187
Other short-term borrowings | 119 | 166
Short Term Financial Liabilities | 2,246 | 2,198
Term borrowings: |  |
Real estate investment trust-preferred | 46 | 46
Term borrowings—new market tax credit investment | 45 | 45
Secured borrowings | 15 | 15
Junior subordinated debentures | 240 | 238
Other long term borrowings | 1,326 | 1,326
Total term borrowings | 1,672 | 1,670
Gross amounts of recognized liabilities |  | 149
Total liabilities | 8,871 | 9,440
Reported Value Measurement | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 32,143 | 32,651
Reported Value Measurement | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 12,082 | 12,033
Reported Value Measurement | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 10,662 | 11,483
Reported Value Measurement | Credit Card and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 985 | 1,102
Reported Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale | 377 | 405
Reported Value Measurement | Government guaranteed loans (SBA and USDA) |  |
Short-term financial assets: |  |
Loans held for sale | 533 | 509
Reported Value Measurement | Other consumer loans- LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 4 | 31
Reported Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 59 | 77
Estimate of Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 56,242 | 57,695
Short-term financial assets: |  |
Interest-bearing deposits with banks | 13,451 | 8,351
Federal funds sold and securities purchased under agreements to resell | 51 | 65
Securities purchased under agreements to resell | 571 | 380
Total short-term financial assets | 14,073 | 8,796
Trading securities | 1,035 | 1,176
Loans held for sale | 976 | 1,025
Securities available for sale at fair value | 8,388 | 8,047
Derivative assets | 480 | 769
Other assets: |  |
Tax credit investments | 404 | 371
Deferred compensation assets | 122 | 118
Equity, mutual funds, and other | 264 | 288
Total other assets | 790 | 777
Total assets | 81,984 | 78,285
Liabilities: |  |
Defined maturity | 4,311 | 5,083
Trading Liabilities | 531 | 353
Short-term financial liabilities: |  |
Federal funds purchased | 777 | 845
Securities sold under agreements to repurchase | 1,350 | 1,187
Other short-term borrowings | 119 | 166
Short Term Financial Liabilities | 2,246 | 2,198
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investment | 45 | 45
Secured borrowings | 15 | 15
Junior subordinated debentures | 237 | 223
Other long term borrowings | 1,476 | 1,455
Total term borrowings | 1,820 | 1,785
Gross amounts of recognized liabilities | 118 | 149
Total liabilities | 9,026 | 9,568
Unfunded Commitments: |  |
Loan commitments | 1 | 2
Standby and other commitments | 8 | 6
Estimate of Fair Value Measurement | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 31,935 | 32,582
Estimate of Fair Value Measurement | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 12,108 | 12,079
Estimate of Fair Value Measurement | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 11,190 | 11,903
Estimate of Fair Value Measurement | Credit Card and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 1,009 | 1,131
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale | 377 | 405
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA) |  |
Short-term financial assets: |  |
Loans held for sale | 536 | 512
Estimate of Fair Value Measurement | Other consumer loans- LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 4 | 31
Estimate of Fair Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 59 | 77
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 13,451 | 8,351
Federal funds sold and securities purchased under agreements to resell | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 13,451 | 8,351
Trading securities | 0 | 0
Loans held for sale | 0 | 0
Securities available for sale at fair value | 0 | 0
Derivative assets | 27 | 63
Other assets: |  |
Tax credit investments | 0 | 0
Deferred compensation assets | 122 | 118
Equity, mutual funds, and other | 29 | 25
Total other assets | 151 | 143
Total assets | 13,629 | 8,557
Liabilities: |  |
Defined maturity | 0 | 0
Trading Liabilities | 0 | 0
Short-term financial liabilities: |  |
Federal funds purchased | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Other short-term borrowings | 0 | 0
Short Term Financial Liabilities | 0 | 0
Term borrowings: |  |
Real estate investment trust-preferred | 0 | 0
Term borrowings—new market tax credit investment | 0 | 0
Secured borrowings | 0 | 0
Junior subordinated debentures | 0 | 0
Other long term borrowings | 0 | 0
Total term borrowings | 0 | 0
Gross amounts of recognized liabilities | 26 | 71
Total liabilities | 26 | 71
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Credit Card and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Government guaranteed loans (SBA and USDA) |  |
Short-term financial assets: |  |
Loans held for sale | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Other consumer loans- LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold and securities purchased under agreements to resell | 51 | 65
Securities purchased under agreements to resell | 571 | 380
Total short-term financial assets | 622 | 445
Trading securities | 1,035 | 1,176
Loans held for sale | 891 | 935
Securities available for sale at fair value | 8,358 | 8,015
Derivative assets | 453 | 706
Other assets: |  |
Tax credit investments | 0 | 0
Deferred compensation assets | 0 | 0
Equity, mutual funds, and other | 0 | 0
Total other assets | 0 | 0
Total assets | 11,359 | 11,277
Liabilities: |  |
Defined maturity | 4,311 | 5,083
Trading Liabilities | 531 | 353
Short-term financial liabilities: |  |
Federal funds purchased | 777 | 845
Securities sold under agreements to repurchase | 1,350 | 1,187
Other short-term borrowings | 119 | 166
Short Term Financial Liabilities | 2,246 | 2,198
Term borrowings: |  |
Real estate investment trust-preferred | 0 | 0
Term borrowings—new market tax credit investment | 0 | 0
Secured borrowings | 0 | 0
Junior subordinated debentures | 0 | 0
Other long term borrowings | 1,476 | 1,455
Total term borrowings | 1,476 | 1,455
Gross amounts of recognized liabilities | 74 | 64
Total liabilities | 8,638 | 9,153
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Credit Card and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale | 352 | 393
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Government guaranteed loans (SBA and USDA) |  |
Short-term financial assets: |  |
Loans held for sale | 535 | 511
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Other consumer loans- LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 4 | 31
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 56,242 | 57,695
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold and securities purchased under agreements to resell | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 0 | 0
Trading securities | 0 | 0
Loans held for sale | 85 | 90
Securities available for sale at fair value | 30 | 32
Derivative assets | 0 | 0
Other assets: |  |
Tax credit investments | 404 | 371
Deferred compensation assets | 0 | 0
Equity, mutual funds, and other | 235 | 263
Total other assets | 639 | 634
Total assets | 56,996 | 58,451
Liabilities: |  |
Defined maturity | 0 | 0
Trading Liabilities | 0 | 0
Short-term financial liabilities: |  |
Federal funds purchased | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Other short-term borrowings | 0 | 0
Short Term Financial Liabilities | 0 | 0
Term borrowings: |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investment | 45 | 45
Secured borrowings | 15 | 15
Junior subordinated debentures | 237 | 223
Other long term borrowings | 0 | 0
Total term borrowings | 344 | 330
Gross amounts of recognized liabilities | 18 | 14
Total liabilities | 362 | 344
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 31,935 | 32,582
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 12,108 | 12,079
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 11,190 | 11,903
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Credit Card and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 1,009 | 1,131
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale | 25 | 12
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Government guaranteed loans (SBA and USDA) |  |
Short-term financial assets: |  |
Loans held for sale | 1 | 1
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Other consumer loans- LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 0 | 0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale | 59 | 77
Contractual Amount |  |
Unfunded Commitments: |  |
Loan commitments | 22,497 | 20,796
Standby and other commitments | $ 789 | $ 751

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- Definition Defined maturity deposits include all certificates of deposit and other time deposits. The fair value is estimated by discounting future cash flows to their present value. Future cash flows are discounted by using the current market rates of similar instruments applicable to the remaining maturity. + References No definition available. + Details
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- Definition Short-term financial liabilities include federal funds purchased, securities sold under agreements to repurchase, and other short-term borrowings. The carrying amount is a reasonable estimate of fair value because of the relatively short time between the origination of the instrument and its expected realization. Other short-term borrowings includes a liability associated with transfers of mortgage servicing rights that did not qualify for sale accounting. This liability is accounted for at elected fair value, which is measured consistent with the related MSR. + References No definition available. + Details
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- Definition Standby commitments may be provided to customers in order to guarantee payment between a customer and a third party - generally to facilitate trade. Fair values are based on fees charged to enter into similar agreements. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. 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- Definition The carrying amount of liabilities as of the balance sheet date that pertain to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities, obligations under repurchase agreements, and securities borrowed arrangements. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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