Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	$ 57,648	$ 54,436
Total accruing	57,786	54,584
Current, non-accruing	160	182
Total non-accruing	316	275
Loans and leases	58,102	54,859
30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	105	108
Past due, non-accruing	19	7
90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	33	40
Past due, non-accruing	137	86
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	31,567	30,885
Total accruing	31,628	30,943
Current, non-accruing	64	97
Total non-accruing	153	125
Loans and leases	31,781	31,068
Commercial | Commercial and industrial | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	50	53
Past due, non-accruing	10	1
Commercial | Commercial and industrial | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	11	5
Past due, non-accruing	79	27
Commercial | Commercial and industrial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	29,309	26,367
Total accruing	29,370	26,425
Current, non-accruing	64	97
Total non-accruing	153	125
Loans and leases	29,523	26,550
Nonaccrual, no allowance	147	99
Commercial | Commercial and industrial | C&I | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	50	53
Past due, non-accruing	10	1
Commercial | Commercial and industrial | C&I | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	11	5
Past due, non-accruing	79	27
Commercial | Commercial and industrial | Loans to mortgage companies
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	2,258	4,518
Total accruing	2,258	4,518
Current, non-accruing	0	0
Total non-accruing	0	0
Loans and leases	2,258	4,518
Commercial | Commercial and industrial | Loans to mortgage companies | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Commercial | Commercial and industrial | Loans to mortgage companies | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	0	0
Commercial | Commercial and industrial | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual, no allowance	5	5
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	13,228	12,109
Commercial | Commercial real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	13,208	12,087
Total accruing	13,219	12,100
Current, non-accruing	7	6
Total non-accruing	9	9
Loans and leases	13,228	12,109
Commercial | Commercial real estate | CRE | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	11	13
Past due, non-accruing	0	1
Commercial | Commercial real estate | CRE | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	2	2
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	12,253	10,772
Consumer | Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	12,046	10,564
Total accruing	12,101	10,634
Current, non-accruing	88	78
Total non-accruing	152	138
Loans and leases	12,253	10,772
Consumer | Consumer real estate | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	37	37
Past due, non-accruing	9	5
Consumer | Consumer real estate | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	18	33
Past due, non-accruing	55	55
Consumer | Consumer real estate | HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	1,967	1,906
Total accruing	1,984	1,919
Current, non-accruing	32	34
Total non-accruing	44	45
Loans and leases	2,028	1,964
Nonaccrual, no allowance	5	7
Consumer | Consumer real estate | HELOC | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	12	7
Past due, non-accruing	4	2
Consumer | Consumer real estate | HELOC | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	6
Past due, non-accruing	8	9
Consumer | Consumer real estate | Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	10,079	8,658
Total accruing	10,117	8,715
Current, non-accruing	56	44
Total non-accruing	108	93
Loans and leases	10,225	8,808
Nonaccrual, no allowance	7	50
Consumer | Consumer real estate | Real estate installment loans | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	25	30
Past due, non-accruing	5	3
Consumer | Consumer real estate | Real estate installment loans | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	13	27
Past due, non-accruing	47	46
Consumer | Credit Card and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	827	900
Total accruing	838	907
Current, non-accruing	1	1
Total non-accruing	2	3
Loans and leases	840	910
Consumer | Credit Card and Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	7	5
Past due, non-accruing	0	0
Consumer | Credit Card and Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	4	2
Past due, non-accruing	1	2
Consumer | Credit Card and Other | Credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	287	292
Total accruing	296	296
Current, non-accruing	0	0
Total non-accruing	0	0
Loans and leases	296	296
Consumer | Credit Card and Other | Credit card | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	5	2
Past due, non-accruing	0	0
Consumer | Credit Card and Other | Credit card | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	4	2
Past due, non-accruing	0	0
Consumer | Credit Card and Other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current, accruing	540	608
Total accruing	542	611
Current, non-accruing	1	1
Total non-accruing	2	3
Loans and leases	544	614
Consumer | Credit Card and Other | Other | 30-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	2	3
Past due, non-accruing	0	0
Consumer | Credit Card and Other | Other | 90+ Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due, accruing	0	0
Past due, non-accruing	$ 1	$ 2