Credit Concentrations - U.S. Government and Agency Obligations and Non-U.S. Government and Agency Obligations that Collateralize Resale Agreements and Securities Borrowed Transactions (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
U.S. government and agency obligations
Concentration Risk [Line Items]
Concentration risk, credit risk, financial instrument, maximum exposure	$ 94,016	$ 86,274
Non-U.S. government and agency obligations
Concentration Risk [Line Items]
Concentration risk, credit risk, financial instrument, maximum exposure	$ 108,677	$ 141,588