Business Combinations - Schedule of Other Liabilities Assumed (Details) - SVB $ in Millions	Mar. 27, 2023 USD ($)
Business Acquisition [Line Items]
Commitments to fund tax credit investments	$ 715
Fair value of derivative financial instruments, net	336
Accrued expenses and accounts payable	262
Reserve for off-balance sheet credit exposures	253
Accrued interest payable	113
Other	203
Other liabilities	$ 1,882