Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Pledged Assets Included in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions		Sep. 30, 2022		Dec. 31, 2021		Sep. 30, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks	[1]	$ 13,970		$ 47,400
Trading assets	[1]	21,082		24,043
Securities available-for-sale	[1]	28,082		35,298
Securities held-to-maturity	[1]	6,656		5,203
Loans	[1]	61,775		55,864
Other assets	[1]	6,474		5,439
Total assets		169,340	[1]	189,232	[1]	$ 201,150
Asset Pledged as Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks		1,213		563
Trading assets		1,188		1,773
Securities available-for-sale		3,287		7,618
Securities held-to-maturity		390		599
Loans		17,026		17,777
Other assets		2,224		1,211
Total assets		$ 25,328		$ 29,541

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2022 and December 31, 2021. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. September 30, 2022December 31, 2021(in millions)AssetsLoans$127 $46 Other assets44 55 Total assets$171 $101 LiabilitiesInterest, taxes and other liabilities$26 $9 Total liabilities$26 $9