Federal, State and Local Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets:
Allowance for credit losses on loans and leases	$ 102	$ 55
Acquisition accounting and fair value adjustments on securities (including OTTI)	227	21
Acquisition accounting and fair value adjustments on loans	36
Capitalized loans costs	46
Compensation and related benefit obligations	23	17
Capitalized research and development costs	10
Net operating loss carryforwards	15	1
Other	18	15
Gross deferred tax assets	477	109
Valuation allowance	(5)
Net deferred tax asset after valuation allowance	472	109
Deferred Tax Liabilities:
Leases	(328)	(360)
Mortgage servicing rights	(105)
Premises and equipment	(18)	(5)
Prepaid pension cost	(29)	(35)
Fair value adjustments on loans		(81)
Amortizable intangibles	(71)	(3)
Acquisition accounting and fair value adjustments on deposits	(9)
Acquisition accounting and fair value adjustments on debt	(10)
Other	(9)	(9)
Gross deferred tax liabilities	(579)	(493)
Net deferred tax liability	$ (107)	$ (384)