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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, 2017
Dec. 31, 2016
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions $ 56,739 $ 66,721
Credit Ratings of the Obligors or the Transactions, Total 56,739  
Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions $ 48,783  
Single name credit default swap [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [1] 2 years 7 months 14 days  
Credit Ratings of the Obligors or the Transactions [1] $ 40,982  
Structured CDS [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [1] 5 months 27 days  
Credit Ratings of the Obligors or the Transactions [1] $ 885  
Index credit derivatives [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [1] 3 years 11 months 17 days  
Credit Ratings of the Obligors or the Transactions [1] $ 5,324  
Total return swaps [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Average Life in years [1] 1 year 6 months 7 days  
Credit Ratings of the Obligors or the Transactions [1] $ 1,592  
Standby Letters of Credit [Member]    
Credit Derivatives [Line Items]    
Average Life in years [2] 1 year 2 months 14 days  
Credit Ratings of the Obligors or the Transactions [2] $ 7,956  
External Credit Rating, Investment Grade [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions, Total 37,882  
External Credit Rating, Investment Grade [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions 32,767  
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 [1] 27,946  
External Credit Rating, Investment Grade [Member] | Structured CDS [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [1] 836  
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 [1] 2,673  
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 [1] 1,312  
External Credit Rating, Investment Grade [Member] | Standby Letters of Credit [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] 5,115  
External Credit Rating, Non Investment Grade [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions, Total 18,857  
External Credit Rating, Non Investment Grade [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions 16,016  
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 [1] 13,036  
External Credit Rating, Non Investment Grade [Member] | Structured CDS [Member] | Sell Protection Credit Derivatives [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [1] 49  
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 [1] 2,651  
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 [1] 280  
External Credit Rating, Non Investment Grade [Member] | Standby Letters of Credit [Member]    
Credit Derivatives [Line Items]    
Credit Ratings of the Obligors or the Transactions [2] $ 2,841  
[1] The credit ratings in the table represent external credit ratings for classification as investment grade and non-investment grade.
[2] 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.