Investment Securities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Fair value of securities pledged	$ 16,900	$ 30,700
Fair value of securities pledged as collateral where counterparty has right to repledge or resell	987	$ 557
Transfer of amortized cost of available for sale debt securities to held to maturity securities	17,100
Transfer of available for sale debt securities to held to maturity securities	15,700
Debt securities, Held to maturity, Allowance for credit loss	$ 0