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Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Summary of Credit Ratings of Credit Risk Related Guarantees (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions $ 48,175 [1] $ 54,356
Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions $ 38,739  
Single name credit default swap [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [2] 3 years 1 month 27 days  
Credit Ratings of the Obligors or the Transactions [2] $ 29,394  
Index credit derivatives [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [2] 4 years 3 months 27 days  
Credit Ratings of the Obligors or the Transactions [2] $ 8,081  
Total return swaps [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [2] 2 years 6 months 30 days  
Credit Ratings of the Obligors or the Transactions [2] $ 1,264  
Standby Letters of Credit [Member]    
Credit Derivatives [Line Items]    
Average Life in years [1] 1 year 2 months 19 days  
Credit Ratings of the Obligors or the Transactions [1] $ 9,436  
External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [1] 32,211  
External Credit Rating, Investment Grade [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions 24,629  
External Credit Rating, Investment Grade [Member] | Single name credit default swap [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 20,491  
External Credit Rating, Investment Grade [Member] | Index credit derivatives [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 3,074  
External Credit Rating, Investment Grade [Member] | Total return swaps [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 1,064  
External Credit Rating, Investment Grade [Member] | Standby Letters of Credit [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [1] 7,582  
External Credit Rating, Non Investment Grade [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [1] 15,964  
External Credit Rating, Non Investment Grade [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions 14,110  
External Credit Rating, Non Investment Grade [Member] | Single name credit default swap [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 8,903  
External Credit Rating, Non Investment Grade [Member] | Index credit derivatives [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 5,007  
External Credit Rating, Non Investment Grade [Member] | Total return swaps [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 200  
External Credit Rating, Non Investment Grade [Member] | Standby Letters of Credit [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [1] $ 1,854  
[1] External ratings for most of the obligors are not available. Presented above are the internal credit ratings which are developed using similar methodologies and rating scale equivalent to external credit ratings for purposes of classification as investment grade and non-investment grade.
[2] The credit ratings in the table represent external credit ratings for classification as investment grade and non-investment grade.