Credit Quality and the Allowance for Loan and Lease Losses - Summary of Recorded Investment in Portfolio Loans and Leases by Age and Class (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due
Loans and Leases	[1],[2]	$ 121,480	$ 112,050
Commercial
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		76,389	70,268
90 Days Past Due and Still Accruing		13	19
Commercial | Current
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		76,211	70,132
Commercial | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		178	136
Commercial | 30-89 Days
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		129	81
Commercial | 90 Days or More
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		49	55
Commercial | Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		57,232	51,659
90 Days Past Due and Still Accruing		11	17
Loans and leases related to SBA Paycheck Protection Program of CARES Act		94	1,300
Commercial | Commercial and industrial loans | Current
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		57,092	51,549
Commercial | Commercial and industrial loans | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		140	110
Commercial | Commercial and industrial loans | 30-89 Days
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		98	61
Loans and leases related to SBA Paycheck Protection Program of CARES Act		0	20
Commercial | Commercial and industrial loans | 90 Days or More
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		42	49
Loans and leases related to SBA Paycheck Protection Program of CARES Act		2	6
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		5,258	4,709
90 Days Past Due and Still Accruing		0	1
Commercial | Commercial mortgage owner-occupied loans | Current
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		5,241	4,701
Commercial | Commercial mortgage owner-occupied loans | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		17	8
Commercial | Commercial mortgage owner-occupied loans | 30-89 Days
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		14	4
Commercial | Commercial mortgage owner-occupied loans | 90 Days or More
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		3	4
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		5,762	5,607
90 Days Past Due and Still Accruing		0	0
Commercial | Commercial mortgage nonowner-occupied loans | Current
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		5,756	5,606
Commercial | Commercial mortgage nonowner-occupied loans | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		6	1
Commercial | Commercial mortgage nonowner-occupied loans | 30-89 Days
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		6	0
Commercial | Commercial mortgage nonowner-occupied loans | 90 Days or More
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		0	1
Commercial | Commercial construction loans
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		5,433	5,241
90 Days Past Due and Still Accruing		0	1
Commercial | Commercial construction loans | Current
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		5,424	5,241
Commercial | Commercial construction loans | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		9	0
Commercial | Commercial construction loans | 30-89 Days
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		7	0
Commercial | Commercial construction loans | 90 Days or More
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		2	0
Commercial | Commercial leases
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		2,704	3,052
90 Days Past Due and Still Accruing		2	0
Commercial | Commercial leases | Current
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		2,698	3,035
Commercial | Commercial leases | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		6	17
Commercial | Commercial leases | 30-89 Days
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		4	16
Commercial | Commercial leases | 90 Days or More
Financing Receivable, Recorded Investment, Past Due
Loans and Leases		$ 2	$ 1

[1] Includes $123 and $154 of residential mortgage loans measured at fair value at December 31, 2022 and 2021, respectively.

[2] Includes $17 and $24 of other short-term investments, $185 and $322 of portfolio loans and leases, $(2) and $(2) of ALLL, $2 and $2 of other assets, $9 and $1 of other liabilities and $118 and $263 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2022 and 2021, respectively. For further information, refer to Note 12.