Loans and Leases - Schedule of Nonaccrual Status (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	$ 828	$ 627
Loans > 90 Days and Accruing	161	63
Financing receivable, accrued interest reversed to nonaccrual status	1	4
Financing receivable, nonaccrual without allowance for credit loss	59	63
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	510	529
Loans > 90 Days and Accruing	146	50
Commercial | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	2	48
Loans > 90 Days and Accruing	0	0
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	46	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	219	228
Loans > 90 Days and Accruing	114	0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	214	184
Loans > 90 Days and Accruing	20	41
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	29	28
Loans > 90 Days and Accruing	4	7
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	94	98
Loans > 90 Days and Accruing	11	13
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	71	75
Loans > 90 Days and Accruing	8	10
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	18	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	224	0
Loans > 90 Days and Accruing	4	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 - growth stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	56	0
Loans > 90 Days and Accruing	0	0
SVB | Investor dependent - early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	60	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	78	0
Loans > 90 Days and Accruing	0	0
SVB | Private Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	27	0
Loans > 90 Days and Accruing	0	0
SVB | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-Accrual Loans	2	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