Loans - Narrative (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred origination costs (fees)		$ 22		$ 17
Net unamortized premium (discount)		(11)		(13)
Interest income that was recorded on nonaccrual loans and included in interest income during the period		0	$ 1
Loans modified			159
Loans, net	[1]	59,797		58,987
Interest only residential mortgage loans		4,453		4,392
90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified, subsequently default			0
Loans, net		311		309
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified		0	2
Loans, net		19,492		19,030
Consumer loans | 90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified, subsequently default		0
Loans, net		99		99
Consumer loans | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral-dependent loans		280		278
Loans modified			1
Loans, net		18,825		18,341
Consumer loans | Residential mortgages | 90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net		91		91
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral-dependent loans		637		618
Loans modified		65	$ 157
Additional commitments for loans modified		59		85
Loans, net		40,305		39,957
Commercial loans | 90+ Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified, subsequently default		1
Loans, net		$ 212		$ 210

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at March 31, 2024 and December 31, 2023. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 15, "Variable Interest Entities," for additional information. March 31, 2024December 31, 2023(in millions)AssetsOther assets$21 $23 Total assets$21 $23 LiabilitiesInterest, taxes and other liabilities$28 $17 Total liabilities$28 $17