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Investment Securities - Gains and Losses Recognized in Income from Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Available-for-sale debt and other securities:    
Realized gains $ 2 $ 29
Realized losses 0 (29)
Impairment losses (5) 0
Net losses on available-for-sale debt and other securities (3) 0
Equity securities:    
Net realized gains 0 0
Net unrealized gains 13 4
Net equity securities gains 13 4
Total (losses) gains recognized in income from available-for-sale debt and other securities, trading debt securities and equity securities 10 4
Commercial Banking Revenue and Wealth and Asset Management Revenue    
Equity securities:    
Total (losses) gains recognized in income from available-for-sale debt and other securities, trading debt securities and equity securities $ 2 $ 1