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Trading Assets and Liabilities - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]      
Derivatives included in trading assets, amount offset $ 1,760 $ 2,653  
Derivatives included in trading liabilities, amount offset 1,321 1,529  
Dividend income on equity securities held for trading 159 165 $ 157
Trading Assets      
Debt and Equity Securities, FV-NI [Line Items]      
Derivatives included in trading assets, amount offset 1,416 2,653  
Trading Liabilities      
Debt and Equity Securities, FV-NI [Line Items]      
Derivatives included in trading liabilities, amount offset $ 1,321 $ 1,180