v3.25.2
Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Credit Ratings of Credit Risk Related Guarantees (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss $ 4,892 $ 5,521
Total, Notional/Maximum Exposure to Loss 17,499 15,428
Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss $ 9,255 $ 6,827
Single name credit default swaps | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Average Life (in years) 1 year 3 months 18 days  
Credit derivatives, Notional/Maximum Exposure to Loss $ 2,093  
Index credit derivatives | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Average Life (in years) 4 years 2 months 12 days  
Credit derivatives, Notional/Maximum Exposure to Loss $ 7,162  
Standby Letters of Credit    
Credit Derivatives [Line Items]    
Average Life (in years) 10 months 24 days  
Standby letters of credit, Notional/Maximum Exposure to Loss $ 8,244  
Investment Grade    
Credit Derivatives [Line Items]    
Total, Notional/Maximum Exposure to Loss 12,191  
Investment Grade | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss 6,234  
Investment Grade | Single name credit default swaps | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss 1,409  
Investment Grade | Index credit derivatives | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss 4,825  
Investment Grade | Standby Letters of Credit    
Credit Derivatives [Line Items]    
Standby letters of credit, Notional/Maximum Exposure to Loss 5,957  
Non-Investment Grade    
Credit Derivatives [Line Items]    
Total, Notional/Maximum Exposure to Loss 5,308  
Non-Investment Grade | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss 3,021  
Non-Investment Grade | Single name credit default swaps | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss 684  
Non-Investment Grade | Index credit derivatives | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit derivatives, Notional/Maximum Exposure to Loss 2,337  
Non-Investment Grade | Standby Letters of Credit    
Credit Derivatives [Line Items]    
Standby letters of credit, Notional/Maximum Exposure to Loss $ 2,287