Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loans and Allowance for Credit Losses [Line Items]
Loans pledged at the Federal Reserve Bank	$ 87,900	$ 87,900	$ 85,800
Unearned interest and deferred fees and costs on originated loans	2,900	2,900	3,100
Foreclosed residential real estate property included in other real estate owned	25	25	23
Foreclosed residential real estate related to mortgage loans whose payments are insured by the Federal Housing Administration or guaranteed by the United States Department of Veterans Affairs	56	56	54
Residential mortgage loans secured by residential real estate in process of foreclosure	928	928	1,100
Loan Restructuring, Trial Modifications, Amount	93
Commitments to lend additional funds	144	144
Allowance For Individually Evaluated Loans		5
Federal Home Loan Bank Advances [Member]
Loans and Allowance for Credit Losses [Line Items]
Loans pledged at the Federal Home Loan Bank	124,600	124,600	134,600
Government National Mortgage Association [Member]
Loans and Allowance for Credit Losses [Line Items]
Residential mortgage loans secured by residential real estate in process of foreclosure	$ 683	$ 683	$ 830

Amount of financing receivable modified on trial basis.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 310
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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Commitments to lend additional funds.

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Loans and allowance for credit losses.

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Pledged financial instruments not separately reported loans receivable pledged for federal reserve bank debt.

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Real estate acquired through foreclosure insured or guaranteed.

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