Derivative Financial Instruments - Fair Value of Derivative Instruments Held For Trading Purposes (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 87,732	[1]	$ 95,353	[1]
Derivative Liabilities	87,454	[2]	94,782	[2]
Trading Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	86,177	[1]	93,870	[1]
Trading Assets [Member] | Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	63,052	[3]	70,865	[3]
Trading Assets [Member] | Foreign exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	14,331	[3]	13,799	[3]
Trading Assets [Member] | Equity contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	1,304	[3]	1,287	[3]
Trading Assets [Member] | Precious metals contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	805	[3]	791	[3]
Trading Assets [Member] | Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	6,685	[3]	7,128	[3]
Trading Liabilities [Member] | Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	63,355	[3]	70,450	[3]
Trading Liabilities [Member] | Foreign exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	14,353	[3]	13,601	[3]
Trading Liabilities [Member] | Equity contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1,310	[3]	1,291	[3]
Trading Liabilities [Member] | Precious metals contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	622	[3]	738	[3]
Trading Liabilities [Member] | Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 6,700	[3]	$ 7,347	[3]

[1] The gross amounts of recognized assets includes $86.2 billion of trading related derivatives which are included in trading assets in our consolidated balance sheet and $1.6 billion of derivatives designated in hedging activities that are included in other assets in our consolidated balance sheet at March 31, 2013.The gross amounts of recognized assets includes $93.9 billion of trading related derivatives which are included in trading assets in our consolidated balance sheet and $1.5 billion of derivatives designated in hedging activities that are included in other assets in our consolidated balance sheet at December 31, 2012.

[2] The gross amounts of recognized liabilities includes $86.3 billion of trading related derivatives which are included in trading liabilities in our consolidated balance sheet and $1.1 billion of derivatives designated in hedging activities that are included in interest, taxes and other liabilities in our consolidated balance sheet at March 31, 2013.The gross amounts of recognized liabilities includes $93.4 billion of trading related derivatives which are included in trading liabilities in our consolidated balance sheet and $1.4 billion of derivatives designated in hedging activities that are included in interest, taxes and other liabilities in our consolidated balance sheet at December 31, 2012.

[3] derivative asset and derivative liabilities presented above may be eligible for netting and consequently may be shown net against a different line item on the consolidated balance sheet. Balance sheet categories in the above table represent the location of the assets and liabilities absent the netting of the balanc