v3.25.2
Securities - Realized Gains and Losses on Investment Securities Transactions Attributable to Available-for-sale Securities (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains $ 7 $ 12 $ 10 $ 14
Gross realized losses (1) (4) (1) (4)
Net realized gains $ 6 $ 8 $ 9 $ 10