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Securities - Realized gains and losses on investment securities Transactions Attributable to available-for-sale securities (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Gross realized gains $ 20 $ 49
Gross realized losses 0 (20)
Net realized gains $ 20 $ 29