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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 | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | $ 60,966 | $ 60,519
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,885 | 1,328
Securities purchased under agreements to resell | 453 | 519
Trading securities | 1,161 | 1,412
Loans held for sale: | 395 | 502
Securities available for sale at fair value | 8,148 | 8,391
Securities held to maturity | 1,311 | 1,323
Derivative assets | 650 | 576
Other Assets Financial Instruments [Abstract] |  |
Total assets | 81,799 | 81,661
Liabilities: |  |
Trading liabilities | 467 | 509
Short Term Financial Liabilities [Abstract] |  |
Securities sold under agreements to repurchase | 1,828 | 1,921
Long-Term Debt, Unclassified [Abstract] |  |
Other long-term borrowings | 1,165 | 1,150
Derivative liabilities | 795 | 675
Total liabilities | 72,626 | 72,370
Fair Value, Inputs, Level 3 | FHLB-Cincinnati Stock |  |
Long-Term Debt, Unclassified [Abstract] |  |
Restricted investments | 31 | 24
Fair Value, Inputs, Level 3 | FRB Stock |  |
Long-Term Debt, Unclassified [Abstract] |  |
Restricted investments | 203 | 203
Reported Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 60,966 | 60,519
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,885 | 1,328
Federal funds sold | 364 | 200
Securities purchased under agreements to resell | 453 | 519
Total short-term financial assets | 2,702 | 2,047
Trading securities | 1,161 | 1,412
Loans held for sale: | 395 | 502
Securities available for sale at fair value | 8,148 | 8,391
Securities held to maturity | 1,311 | 1,323
Derivative assets | 650 | 577
Other Assets Financial Instruments [Abstract] |  |
Tax credit investments | 662 | 665
Deferred compensation mutual funds | 107 | 102
Equity, mutual funds, and other | 268 | 261
Total other assets | 1,037 | 1,028
Total assets | 76,370 | 75,799
Liabilities: |  |
Defined maturity deposits | 6,297 | 6,804
Trading liabilities | 467 | 509
Short Term Financial Liabilities [Abstract] |  |
Federal funds purchased | 309 | 302
Securities sold under agreements to repurchase | 1,828 | 1,921
Other short-term borrowings | 566 | 326
Total short-term financial liabilities | 2,703 | 2,549
Long-Term Debt, Unclassified [Abstract] |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investment | 76 | 65
Secured borrowings | 6 | 3
Junior subordinated debentures | 150 | 150
Other long-term borrowings | 886 | 885
Total term borrowings | 1,165 | 1,150
Derivative liabilities | 816 | 699
Total liabilities | 11,448 | 11,711
Reported Value Measurement | Commercial, financial and industrial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 32,563 | 32,294
Reported Value Measurement | Commercial Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 14,245 | 14,044
Reported Value Measurement | Consumer Real Estate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 13,414 | 13,417
Reported Value Measurement | Credit card and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 744 | 764
Reported Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 84 | 68
Reported Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 284 | 406
Reported Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 27 | 28
Estimate of Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net loans and leases | 59,173 | 58,851
Short-term financial assets: |  |
Interest-bearing deposits with banks | 1,885 | 1,328
Federal funds sold | 364 | 200
Securities purchased under agreements to resell | 453 | 519
Total short-term financial assets | 2,702 | 2,047
Trading securities | 1,161 | 1,412
Loans held for sale: | 395 | 503
Securities available for sale at fair value | 8,148 | 8,391
Securities held to maturity | 1,131 | 1,161
Derivative assets | 650 | 577
Other Assets Financial Instruments [Abstract] |  |
Tax credit investments | 652 | 653
Deferred compensation mutual funds | 107 | 102
Equity, mutual funds, and other | 268 | 261
Total other assets | 1,027 | 1,016
Total assets | 74,387 | 73,958
Liabilities: |  |
Defined maturity deposits | 6,333 | 6,851
Trading liabilities | 467 | 509
Short Term Financial Liabilities [Abstract] |  |
Federal funds purchased | 309 | 302
Securities sold under agreements to repurchase | 1,828 | 1,921
Other short-term borrowings | 566 | 326
Total short-term financial liabilities | 2,703 | 2,549
Long-Term Debt, Unclassified [Abstract] |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investment | 71 | 60
Secured borrowings | 6 | 3
Junior subordinated debentures | 150 | 150
Other long-term borrowings | 843 | 824
Total term borrowings | 1,117 | 1,084
Derivative liabilities | 816 | 699
Total liabilities | 11,436 | 11,692
Unfunded Commitments [Abstract] |  |
Loan commitments | 1 | 1
Standby and other commitments | 7 | 8
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 | 31,961 | 31,673
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 | 13,968 | 13,831
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 | 12,536 | 12,605
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 | 708 | 742
Estimate of Fair Value Measurement | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 84 | 68
Estimate of Fair Value Measurement | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 284 | 407
Estimate of Fair Value Measurement | Mortgage loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 27 | 28
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 | 1,885 | 1,328
Federal funds sold | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 1,885 | 1,328
Trading securities | 0 | 0
Loans held for sale: | 0 | 0
Securities available for sale at fair value | 0 | 0
Securities held to maturity | 0 | 0
Derivative assets | 5 | 9
Other Assets Financial Instruments [Abstract] |  |
Tax credit investments | 0 | 0
Deferred compensation mutual funds | 107 | 102
Equity, mutual funds, and other | 34 | 34
Total other assets | 141 | 136
Total assets | 2,031 | 1,473
Liabilities: |  |
Defined maturity deposits | 0 | 0
Trading liabilities | 0 | 0
Short Term Financial Liabilities [Abstract] |  |
Federal funds purchased | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Other short-term borrowings | 0 | 0
Total short-term financial liabilities | 0 | 0
Long-Term Debt, Unclassified [Abstract] |  |
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
Derivative liabilities | 4 | 10
Total liabilities | 4 | 10
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 | USDA & SBA 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 | 364 | 200
Securities purchased under agreements to resell | 453 | 519
Total short-term financial assets | 817 | 719
Trading securities | 1,142 | 1,399
Loans held for sale: | 354 | 449
Securities available for sale at fair value | 8,148 | 8,391
Securities held to maturity | 1,131 | 1,161
Derivative assets | 645 | 568
Other Assets Financial Instruments [Abstract] |  |
Tax credit investments | 0 | 0
Deferred compensation mutual funds | 0 | 0
Equity, mutual funds, and other | 0 | 0
Total other assets | 0 | 0
Total assets | 12,237 | 12,687
Liabilities: |  |
Defined maturity deposits | 6,333 | 6,851
Trading liabilities | 467 | 509
Short Term Financial Liabilities [Abstract] |  |
Federal funds purchased | 309 | 302
Securities sold under agreements to repurchase | 1,828 | 1,921
Other short-term borrowings | 566 | 326
Total short-term financial liabilities | 2,703 | 2,549
Long-Term Debt, Unclassified [Abstract] |  |
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 | 843 | 824
Total term borrowings | 843 | 824
Derivative liabilities | 792 | 666
Total liabilities | 11,138 | 11,399
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: | 70 | 42
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | USDA & SBA loans - LOCOM |  |
Short-term financial assets: |  |
Loans held for sale: | 284 | 407
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 | 59,173 | 58,851
Short-term financial assets: |  |
Interest-bearing deposits with banks | 0 | 0
Federal funds sold | 0 | 0
Securities purchased under agreements to resell | 0 | 0
Total short-term financial assets | 0 | 0
Trading securities | 19 | 13
Loans held for sale: | 41 | 54
Securities available for sale at fair value | 0 | 0
Securities held to maturity | 0 | 0
Derivative assets | 0 | 0
Other Assets Financial Instruments [Abstract] |  |
Tax credit investments | 652 | 653
Deferred compensation mutual funds | 0 | 0
Equity, mutual funds, and other | 234 | 227
Total other assets | 886 | 880
Total assets | 60,119 | 59,798
Liabilities: |  |
Defined maturity deposits | 0 | 0
Trading liabilities | 0 | 0
Short Term Financial Liabilities [Abstract] |  |
Federal funds purchased | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Other short-term borrowings | 0 | 0
Total short-term financial liabilities | 0 | 0
Long-Term Debt, Unclassified [Abstract] |  |
Real estate investment trust-preferred | 47 | 47
Term borrowings—new market tax credit investment | 71 | 60
Secured borrowings | 6 | 3
Junior subordinated debentures | 150 | 150
Other long-term borrowings | 0 | 0
Total term borrowings | 274 | 260
Derivative liabilities | 20 | 23
Total liabilities | 294 | 283
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 | 31,961 | 31,673
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 | 13,968 | 13,831
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 | 12,536 | 12,605
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 | 708 | 742
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | Mortgage loans (elected fair value) |  |
Short-term financial assets: |  |
Loans held for sale: | 14 | 26
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3 | USDA & SBA 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: | 27 | 28
Contractual Amount |  |
Unfunded Commitments [Abstract] |  |
Loan commitments | 23,227 | 24,579
Standby and other commitments | $ 780 | $ 746

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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 assets include federal funds sold, securities purchased under agreements to resell, and interest bearing deposits with other financial institutions. + 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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