Business Combinations - Summary of Preliminary Fair Value of The Identifiable Tangible and Intangible Assets and Liabilities (Parenthetical) (Detail) $ in Billions	Dec. 01, 2022 USD ($)
MUFG Union Bank [Member]
Business Acquisition [Line Items]
Discounted liability for excess capital received	$ 3.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Balance Type:	na
Period Type:	duration