Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Pledged Assets Included in Consolidated Balance Sheet (Detail) - USD ($) $ in Millions		Jun. 30, 2022		Dec. 31, 2021		Jun. 30, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks	[1]	$ 42,538		$ 47,400
Trading assets	[1]	18,708		24,043
Securities available-for-sale	[1]	31,062		35,298
Securities held-to-maturity	[1]	4,666		5,203
Loans	[1]	61,798		55,864
Other assets, net of allowance for credit losses of $1 million at both June 30, 2022 and December 31, 2021	[1]	6,087		5,439
Total assets		171,232	[1]	189,232	[1]	$ 194,888
Asset Pledged as Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest bearing deposits with banks		934		563
Trading assets		1,559		1,773
Securities available-for-sale		4,874		7,618
Securities held-to-maturity		423		599
Loans		16,716		17,777
Other assets, net of allowance for credit losses of $1 million at both June 30, 2022 and December 31, 2021		1,637		1,211
Total assets		$ 26,143		$ 29,541

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 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. June 30, 2022December 31, 2021(in millions)AssetsLoans$118 $46 Other assets46 55 Total assets$164 $101 LiabilitiesInterest, taxes and other liabilities$28 $9 Total liabilities$28 $9