Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Pledged Assets Included in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks	[1]	$ 25,015		$ 17,744
Trading assets	[1]	22,115		21,730
Fair Value	[1]	25,696		27,345
Securities held-to-maturity	[1]	15,076		7,317
Loans, net	[1]	58,987		59,380
Other assets	[1]	6,490		6,754
Total assets		168,238	[1]	164,655	[1]	$ 189,232
Asset Pledged as Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks		998		878
Trading assets		3,046		1,255
Fair Value		9,773		3,179
Securities held-to-maturity		5,387		466
Loans, net		18,810		17,530
Other assets		934		1,319
Total assets		$ 38,948		$ 24,627

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2023 and 2022. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20232022(in millions)AssetsLoans, net$— $162 Other assets23 44 Total assets$23 $206 LiabilitiesInterest, taxes and other liabilities$17 $22 Total liabilities$17 $22