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Derivative Financial Instruments - Notional Value of Derivative Contracts (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Total $ 3,074,468 $ 4,807,851
Interest rate contracts [Member]    
Derivative [Line Items]    
Total 1,569,281 3,051,548
Interest Rate Futures and Forwards [Member]    
Derivative [Line Items]    
Total 298,841 597,980
Interest Rate Swap [Member]    
Derivative [Line Items]    
Total 1,166,115 2,130,442
Interest Rate Options Written [Member]    
Derivative [Line Items]    
Total 53,736 158,861
Interest Rate Options Purchased [Member]    
Derivative [Line Items]    
Total 50,589 164,265
Foreign exchange contracts [Member]    
Derivative [Line Items]    
Total 1,284,001 1,520,980
Foreign Exchange Swaps, Futures and Forwards [Member]    
Derivative [Line Items]    
Total 1,161,461 1,362,959
Foreign Exchange Options Written [Member]    
Derivative [Line Items]    
Total 37,854 44,876
Foreign Exchange Options Purchased [Member]    
Derivative [Line Items]    
Total 38,261 46,085
Foreign Exchange Spot [Member]    
Derivative [Line Items]    
Total 46,425 67,060
Commodities, equities and precious metals contracts [Member]    
Derivative [Line Items]    
Total 141,430 144,230
Commodities, Equities and Precious Metals, Swaps, Futures and Forwards [Member]    
Derivative [Line Items]    
Total 63,718 55,678
Commodities, Equities and Precious Metals Options Written [Member]    
Derivative [Line Items]    
Total 33,745 39,035
Commodities, Equities and Precious Metals Options Purchased [Member]    
Derivative [Line Items]    
Total 43,967 49,517
Credit contracts [Member]    
Derivative [Line Items]    
Total 78,645 90,049
Other Contracts [Member]    
Derivative [Line Items]    
Total [1] $ 1,111 $ 1,044
[1] Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares.