Loans and Leases - Schedule of Nonaccrual Status (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	$ 929	$ 627
Loans > 90 Days and Accruing	74	63
Financing receivable, accrued interest reversed to nonaccrual status	5	4
Financing receivable, nonaccrual without allowance for credit loss	74	63
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	622	529
Loans > 90 Days and Accruing	42	50
Commercial | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	4	48
Loans > 90 Days and Accruing	0	0
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	51	41
Loans > 90 Days and Accruing	8	2
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	318	228
Loans > 90 Days and Accruing	1	0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	216	184
Loans > 90 Days and Accruing	30	41
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	33	28
Loans > 90 Days and Accruing	3	7
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	94	98
Loans > 90 Days and Accruing	10	13
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	72	75
Loans > 90 Days and Accruing	7	10
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	17	18
Loans > 90 Days and Accruing	0	0
Consumer | Consumer auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	4	4
Loans > 90 Days and Accruing	0	0
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	1	1
Loans > 90 Days and Accruing	3	3
SVB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	213	0
Loans > 90 Days and Accruing	22	0
SVB | Global fund banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	0	0
Loans > 90 Days and Accruing	0	0
SVB | Investor dependent - early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	26	0
Loans > 90 Days and Accruing	3	0
SVB | Investor dependent - growth stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	100	0
Loans > 90 Days and Accruing	0	0
SVB | Innovation C&I and cash flow dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	43	0
Loans > 90 Days and Accruing	13	0
SVB | Private Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	29	0
Loans > 90 Days and Accruing	2	0
SVB | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	14	0
Loans > 90 Days and Accruing	0	0
SVB | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	1	0
Loans > 90 Days and Accruing	$ 4	$ 0