Loans and Leases - Accruing and Non-Accruing Loans by Class (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 63,461	$ 61,853
Total Accruing	63,552	61,963
Current, non-accruing	395	372
Total Non- Accruing	604	602
Loans and leases	64,156	62,565
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	83	89
Past due, non-accruing	62	51
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	8	21
Past due, non-accruing	147	179
Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	35,646	33,222
Total Accruing	35,681	33,255
Current, non-accruing	120	101
Total Non- Accruing	224	173
Loans and leases	35,905	33,428
Commercial | Commercial, financial, and industrial | General C I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	211	172
Commercial | Commercial, financial, and industrial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	238	287
Commercial | Commercial, financial, and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	34	32
Past due, non-accruing	35	26
Commercial | Commercial, financial, and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	69	46
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,563	14,421
Commercial | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,563	14,421
Commercial | Credit card and other:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	143	174
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	14,108	14,047
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,921	13,845
Total Accruing	13,968	13,914
Current, non-accruing	57	50
Total Non- Accruing	140	133
Loans and leases	14,108	14,047
Consumer | Consumer real estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	3	3
Consumer | Consumer real estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	8	9
Consumer | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	41	50
Past due, non-accruing	16	14
Consumer | Consumer real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	6	19
Past due, non-accruing	67	69
Consumer | Credit card and other:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	573	662
Total Accruing	579	667
Current, non-accruing	0	0
Total Non- Accruing	1	2
Loans and leases	580	669
Consumer | Credit card and other: | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	4
Past due, non-accruing	0	1
Consumer | Credit card and other: | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	1	1
General C I | Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	30,943	29,751
Total Accruing	30,978	29,784
Current, non-accruing	120	101
Total Non- Accruing	224	173
Loans and leases	31,202	29,957
General C I | Commercial | Commercial, financial, and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	34	32
Past due, non-accruing	35	26
General C I | Commercial | Commercial, financial, and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	69	46
Loans to mortgage companies | Commercial | Commercial, financial, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	4,703	3,471
Total Accruing	4,703	3,471
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	4,703	3,471
Loans to mortgage companies | Commercial | Commercial, financial, and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Loans to mortgage companies | Commercial | Commercial, financial, and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
CRE | Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,321	14,124
Total Accruing	13,324	14,127
Current, non-accruing	218	221
Total Non- Accruing	239	294
Loans and leases	13,563	14,421
CRE | Commercial real estate | Commercial real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	3
Past due, non-accruing	11	10
CRE | Commercial real estate | Commercial real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	10	63
HELOC | Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,115	2,045
Total Accruing	2,129	2,058
Current, non-accruing	17	19
Total Non- Accruing	35	34
Loans and leases	2,164	2,092
HELOC | Consumer | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	14	11
Past due, non-accruing	7	4
HELOC | Consumer | Consumer real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	2
Past due, non-accruing	11	11
Real estate installment loans | Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	11,806	11,800
Total Accruing	11,839	11,856
Current, non-accruing	40	31
Total Non- Accruing	105	99
Loans and leases	11,944	11,955
Real estate installment loans | Consumer | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	27	39
Past due, non-accruing	9	10
Real estate installment loans | Consumer | Consumer real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	6	17
Past due, non-accruing	56	58
Credit card | Consumer | Credit card and other:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	224	262
Total Accruing	228	265
Current, non-accruing	0	0
Total Non- Accruing	0	0
Loans and leases	228	265
Credit card | Consumer | Credit card and other: | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	3	2
Past due, non-accruing	0	0
Credit card | Consumer | Credit card and other: | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	1	1
Past due, non-accruing	0	0
Other | Consumer | Credit card and other:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	349	400
Total Accruing	351	402
Current, non-accruing	0	0
Total Non- Accruing	1	2
Loans and leases	352	404
Other | Consumer | Credit card and other: | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	2	2
Past due, non-accruing	0	1
Other | Consumer | Credit card and other: | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	$ 1	$ 1