Fair Value of Assets and Liabilities - Summary Of Book Value And Estimated Fair Value Of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Short-term financial assets:
Interest-bearing deposits with banks	$ 1,384	$ 14,907
Securities purchased under agreements to resell	353	488
Trading securities:	1,375	1,601
Loans held-for-sale	590	1,172
Securities held to maturity (fair value of $1,209 and $705, respectively)	1,371	712
Gross amounts of recognized assets	458	323
Other assets:
Total assets	78,953	89,092
Liabilities:
Trading liabilities	335	426
Short-term financial liabilities:
Securities sold under agreements to repurchase	1,013	1,247
Term borrowings:
Other long term borrowings	1,597	1,590
Gross amounts of recognized liabilities	929	103
Total liabilities	70,406	80,598
Level 3 | FHLB-Cincinnati Stock
Term borrowings:
Restricted investments	50	29
Level 3 | FRB Stock
Term borrowings:
Restricted investments	203	203
Reported Value Measurement
Assets
Total loans, net of unearned income and allowance for loan losses	57,417	54,189
Short-term financial assets:
Interest-bearing deposits with banks	1,384	14,907
Federal funds sold	129	153
Securities purchased under agreements to resell	353	488
Total short-term financial assets	1,866	15,548
Trading securities:	1,375	1,601
Loans held-for-sale	590	1,172
Securities available for sale at fair value	8,836	8,707
Securities held to maturity (fair value of $1,209 and $705, respectively)	1,371	712
Gross amounts of recognized assets	460	324
Other assets:
Tax credit investments	547	456
Deferred compensation mutual funds	112	125
Equity, mutual funds, and other	275	257
Total other assets	934	838
Total assets	72,849	83,091
Liabilities:
Defined maturity	2,887	3,500
Trading liabilities	335	426
Short-term financial liabilities:
Federal funds purchased	400	775
Securities sold under agreements to repurchase	1,013	1,247
Other short-term borrowings	1,093	102
Total short-term financial liabilities	2,506	2,124
Term borrowings:
Real estate investment trust-preferred	46	46
Term borrowings—new market tax credit investment	66	59
Secured borrowings	3	6
Junior subordinated debentures	148	148
Other long term borrowings	1,334	1,331
Total term borrowings	1,597	1,590
Gross amounts of recognized liabilities	958	128
Total liabilities	8,283	7,768
Reported Value Measurement | Commercial and industrial
Assets
Total loans, net of unearned income and allowance for loan losses	31,473	30,734
Reported Value Measurement | Commercial real estate
Assets
Total loans, net of unearned income and allowance for loan losses	13,082	11,955
Reported Value Measurement | Consumer real estate
Assets
Total loans, net of unearned income and allowance for loan losses	12,053	10,609
Reported Value Measurement | Credit Card and Other
Assets
Total loans, net of unearned income and allowance for loan losses	809	891
Reported Value Measurement | Mortgage Loans
Short-term financial assets:
Loans held-for-sale	51	258
Reported Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	506	853
Reported Value Measurement | Other
Short-term financial assets:
Loans held-for-sale		24
Reported Value Measurement | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale	33	37
Estimate of Fair Value Measurement
Assets
Total loans, net of unearned income and allowance for loan losses	56,982	55,023
Short-term financial assets:
Interest-bearing deposits with banks	1,384	14,907
Federal funds sold	129	153
Securities purchased under agreements to resell	353	488
Total short-term financial assets	1,866	15,548
Trading securities:	1,375	1,601
Loans held-for-sale	596	1,175
Securities available for sale at fair value	8,836	8,707
Securities held to maturity (fair value of $1,209 and $705, respectively)	1,209	705
Gross amounts of recognized assets	460	324
Other assets:
Tax credit investments	542	450
Deferred compensation mutual funds	112	125
Equity, mutual funds, and other	275	257
Total other assets	929	832
Total assets	70,726	83,915
Liabilities:
Defined maturity	2,890	3,524
Trading liabilities	335	426
Short-term financial liabilities:
Federal funds purchased	400	775
Securities sold under agreements to repurchase	1,013	1,247
Other short-term borrowings	1,093	102
Total short-term financial liabilities	2,506	2,124
Term borrowings:
Real estate investment trust-preferred	47	47
Term borrowings—new market tax credit investment	59	58
Secured borrowings	3	6
Junior subordinated debentures	150	150
Other long term borrowings	1,301	1,452
Total term borrowings	1,560	1,713
Gross amounts of recognized liabilities	958	128
Total liabilities	8,249	7,915
Loan commitments	1	1
Standby and other commitments	7	6
Estimate of Fair Value Measurement | Commercial and industrial
Assets
Total loans, net of unearned income and allowance for loan losses	31,329	31,020
Estimate of Fair Value Measurement | Commercial real estate
Assets
Total loans, net of unearned income and allowance for loan losses	12,909	11,986
Estimate of Fair Value Measurement | Consumer real estate
Assets
Total loans, net of unearned income and allowance for loan losses	11,934	11,111
Estimate of Fair Value Measurement | Credit Card and Other
Assets
Total loans, net of unearned income and allowance for loan losses	810	906
Estimate of Fair Value Measurement | Mortgage Loans
Short-term financial assets:
Loans held-for-sale	51	258
Estimate of Fair Value Measurement | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	512	856
Estimate of Fair Value Measurement | Other
Short-term financial assets:
Loans held-for-sale		24
Estimate of Fair Value Measurement | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale	33	37
Estimate of Fair Value Measurement | Level 1
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Short-term financial assets:
Interest-bearing deposits with banks	1,384	14,907
Federal funds sold	0	0
Securities purchased under agreements to resell	0	0
Total short-term financial assets	1,384	14,907
Trading securities:	0	0
Loans held-for-sale	0	0
Securities available for sale at fair value	0	0
Securities held to maturity (fair value of $1,209 and $705, respectively)	0	0
Gross amounts of recognized assets	9	12
Other assets:
Tax credit investments	0	0
Deferred compensation mutual funds	112	125
Equity, mutual funds, and other	22	25
Total other assets	134	150
Total assets	0	15,069
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
Total 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	8	11
Total liabilities	8	11
Estimate of Fair Value Measurement | Level 1 | Commercial and industrial
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 1 | Commercial real estate
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 1 | Consumer real estate
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 1 | Credit Card and Other
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 1 | Mortgage Loans
Short-term financial assets:
Loans held-for-sale	0	0
Estimate of Fair Value Measurement | Level 1 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	0	0
Estimate of Fair Value Measurement | Level 1 | Other
Short-term financial assets:
Loans held-for-sale		0
Estimate of Fair Value Measurement | Level 1 | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale	0	0
Estimate of Fair Value Measurement | Level 2
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Short-term financial assets:
Interest-bearing deposits with banks	0	0
Federal funds sold	129	153
Securities purchased under agreements to resell	353	488
Total short-term financial assets	482	641
Trading securities:	1,350	1,563
Loans held-for-sale	541	1,109
Securities available for sale at fair value	8,836	8,707
Securities held to maturity (fair value of $1,209 and $705, respectively)	1,209	705
Gross amounts of recognized assets	451	312
Other assets:
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	12,869	13,037
Liabilities:
Defined maturity	2,890	3,524
Trading liabilities	335	426
Short-term financial liabilities:
Federal funds purchased	400	775
Securities sold under agreements to repurchase	1,013	1,247
Other short-term borrowings	1,093	102
Total short-term financial liabilities	2,506	2,124
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	1,301	1,452
Total term borrowings	1,301	1,452
Gross amounts of recognized liabilities	923	94
Total liabilities	7,955	7,620
Estimate of Fair Value Measurement | Level 2 | Commercial and industrial
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 2 | Commercial real estate
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 2 | Consumer real estate
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 2 | Credit Card and Other
Assets
Total loans, net of unearned income and allowance for loan losses	0	0
Estimate of Fair Value Measurement | Level 2 | Mortgage Loans
Short-term financial assets:
Loans held-for-sale	29	230
Estimate of Fair Value Measurement | Level 2 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	512	855
Estimate of Fair Value Measurement | Level 2 | Other
Short-term financial assets:
Loans held-for-sale		24
Estimate of Fair Value Measurement | Level 2 | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale	0	0
Estimate of Fair Value Measurement | Level 3
Assets
Total loans, net of unearned income and allowance for loan losses	56,982	55,023
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:	25	38
Loans held-for-sale	55	66
Securities available for sale at fair value	0	0
Securities held to maturity (fair value of $1,209 and $705, respectively)	0	0
Gross amounts of recognized assets	0	0
Other assets:
Tax credit investments	542	450
Deferred compensation mutual funds	0	0
Equity, mutual funds, and other	253	232
Total other assets	795	682
Total assets	57,857	55,809
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
Total short-term financial liabilities	0	0
Term borrowings:
Real estate investment trust-preferred	47	47
Term borrowings—new market tax credit investment	59	58
Secured borrowings	3	6
Junior subordinated debentures	150	150
Other long term borrowings	0	0
Total term borrowings	259	261
Gross amounts of recognized liabilities	27	23
Total liabilities	286	284
Estimate of Fair Value Measurement | Level 3 | Commercial and industrial
Assets
Total loans, net of unearned income and allowance for loan losses	31,329	31,020
Estimate of Fair Value Measurement | Level 3 | Commercial real estate
Assets
Total loans, net of unearned income and allowance for loan losses	12,909	11,986
Estimate of Fair Value Measurement | Level 3 | Consumer real estate
Assets
Total loans, net of unearned income and allowance for loan losses	11,934	11,111
Estimate of Fair Value Measurement | Level 3 | Credit Card and Other
Assets
Total loans, net of unearned income and allowance for loan losses	810	906
Estimate of Fair Value Measurement | Level 3 | Mortgage Loans
Short-term financial assets:
Loans held-for-sale	22	28
Estimate of Fair Value Measurement | Level 3 | Government guaranteed loans (SBA and USDA)
Short-term financial assets:
Loans held-for-sale	0	1
Estimate of Fair Value Measurement | Level 3 | Other
Short-term financial assets:
Loans held-for-sale		0
Estimate of Fair Value Measurement | Level 3 | Mortgage Loan - LOCOM
Short-term financial assets:
Loans held-for-sale	33	37
Contractual Amount
Term borrowings:
Loan commitments	25,953	24,229
Standby and other commitments	$ 754	$ 810