v3.26.1
Trading Assets and Liabilities - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]          
Derivatives included in trading assets, amount offset $ 2,690   $ 2,690   $ 1,911
Derivatives included in trading liabilities, amount offset 995   995   1,143
Dividend income on equity securities held for trading 47 $ 34 94 $ 76  
Trading Liabilities          
Debt and Equity Securities, FV-NI [Line Items]          
Derivatives included in trading liabilities, amount offset 995   995   1,143
Trading Assets          
Debt and Equity Securities, FV-NI [Line Items]          
Derivatives included in trading assets, amount offset $ 2,337   $ 2,337   $ 1,600