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Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Credit Ratings of Credit Risk Related Guarantees (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors $ 14,683 $ 10,474
Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors $ 6,319  
Single name credit default swap | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Average Life (in years) 1 year 10 months 24 days  
Credit Ratings of the Obligors $ 1,711  
Index credit derivatives | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Average Life (in years) 5 years 7 months 6 days  
Credit Ratings of the Obligors $ 4,608  
Standby Letters of Credit    
Credit Derivatives [Line Items]    
Average Life (in years) 1 year 2 months 12 days  
Credit Ratings of the Obligors $ 8,364  
Investment Grade    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 11,126  
Investment Grade | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 4,548  
Investment Grade | Single name credit default swap | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 1,065  
Investment Grade | Index credit derivatives | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 3,483  
Investment Grade | Standby Letters of Credit    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 6,578  
Non-Investment Grade    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 3,557  
Non-Investment Grade | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 1,771  
Non-Investment Grade | Single name credit default swap | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 646  
Non-Investment Grade | Index credit derivatives | Sell-protection Credit Derivatives    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors 1,125  
Non-Investment Grade | Standby Letters of Credit    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors $ 1,786