Derivative Positions (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Derivative asset positions	$ 7,568		$ 8,656
Derivative liability positions, fair value	6,795		7,514
Derivative Financial Instruments, Assets
Notional amount of derivatives	138,451	[1]	135,993	[2]
Derivative asset positions	7,568	[1]	8,656	[2]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Cash Flow Hedging
Derivatives designated as hedging relationships, notional amount	(17,350)	[1],[3]	(17,350)	[2],[3]
Derivative asset positions	720	[1],[3]	771	[2],[3]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract [Member] | Floating Rate Loans | Trading Account Assets [Member]
Derivatives designated as hedging relationships, notional amount	(17,350)	[1],[3]	(17,350)	[2],[3]
Derivative asset positions	720	[1],[3]	771	[2],[3]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Fair Value Hedging
Derivatives designated as hedging relationships, notional amount	(1,000)	[1],[4]	(1,000)	[2],[5]
Derivative asset positions	62	[1],[4]	61	[2],[5]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Contract [Member] | Fixed Rate Debt | Trading Account Assets [Member]
Derivatives designated as hedging relationships, notional amount	(1,000)	[1],[4]	(1,000)	[2],[5]
Derivative asset positions	62	[1],[4]	61	[2],[5]
Derivative Financial Instruments, Assets | Nondesignated
Derivatives not designated as hedging instruments, notional amount	120,101	[1],[6]	117,643	[2],[6]
Derivative asset positions	6,786	[1],[6]	7,824	[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract [Member] | Fixed Rate Debt | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	0		0
Derivative asset positions	0		0
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	3,330	[1],[6]	6,185	[2],[6]
Derivative asset positions	89	[1],[6]	150	[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract [Member] | Loans | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	5,767	[1],[6],[7]	2,333	[2],[6],[8]
Derivative asset positions	10	[1],[6],[7]	6	[2],[6],[8]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract [Member] | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	80,747	[1],[6],[9]	81,930	[10],[2],[6]
Derivative asset positions	4,966	[1],[6],[9]	6,044	[10],[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Foreign Exchange Contract | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	2,309	[1],[6]	2,451	[2],[6]
Derivative asset positions	65	[1],[6]	66	[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	32		0
Derivative asset positions	2		0
Derivative Financial Instruments, Assets | Nondesignated | Credit Risk Contract [Member] | Loans | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	0		0
Derivative asset positions	0		0
Derivative Financial Instruments, Assets | Nondesignated | Credit Risk Contract [Member] | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	1,819	[1],[11],[6]	1,958	[12],[2],[6]
Derivative asset positions	58	[1],[11],[6]	55	[12],[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Equity Contract | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	19,350	[1],[6],[9]	15,748	[10],[2],[6]
Derivative asset positions	1,467	[1],[6],[9]	1,342	[10],[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Other Contract | Loans | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	6,508	[1],[13],[6]	6,783	[14],[2],[6]
Derivative asset positions	99	[1],[13],[6]	132	[14],[2],[6]
Derivative Financial Instruments, Assets | Nondesignated | Other Contract | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	239	[1],[6]	255	[2],[6]
Derivative asset positions	30	[1],[6]	29	[2],[6]
Derivative Financial Instruments, Liabilities [Member]
Notional amount of derivatives	137,752	[1]	133,283	[2]
Derivative liability positions, fair value	6,795	[1]	7,514	[2]
Derivative Financial Instruments, Liabilities [Member] | Designated as Hedging Instrument | Cash Flow Hedging
Derivatives designated as hedging relationships, notional amount	0		0
Derivative liability positions, fair value	0		0
Derivative Financial Instruments, Liabilities [Member] | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract [Member] | Floating Rate Loans | Trading Liabilities [Member]
Derivatives designated as hedging relationships, notional amount	0		0
Derivative liability positions, fair value	0		0
Derivative Financial Instruments, Liabilities [Member] | Designated as Hedging Instrument | Fair Value Hedging
Derivatives designated as hedging relationships, notional amount	0		0
Derivative liability positions, fair value	0		0
Derivative Financial Instruments, Liabilities [Member] | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Contract [Member] | Fixed Rate Debt | Trading Liabilities [Member]
Derivatives designated as hedging relationships, notional amount	0		0
Derivative liability positions, fair value	0		0
Derivative Financial Instruments, Liabilities [Member] | Nondesignated
Derivatives not designated as hedging instruments, notional amount	137,752	[1],[6]	133,283	[2],[6]
Derivative liability positions, fair value	6,795	[1],[6]	7,514	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Interest Rate Contract [Member] | Fixed Rate Debt | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	60	[1],[6]	60	[2],[6]
Derivative liability positions, fair value	10	[1],[6]	10	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	13,093	[1],[6]	12,643	[2],[6]
Derivative liability positions, fair value	47	[1],[6]	33	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Interest Rate Contract [Member] | Loans | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	7,151	[1],[6],[7]	7,076	[2],[6],[8]
Derivative liability positions, fair value	32	[1],[6],[7]	15	[2],[6],[8]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Interest Rate Contract [Member] | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	85,887	[1],[6],[9]	86,037	[10],[2],[6]
Derivative liability positions, fair value	4,732	[1],[6],[9]	5,777	[10],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Foreign Exchange Contract | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	2,094	[1],[6]	2,326	[2],[6]
Derivative liability positions, fair value	63	[1],[6]	63	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	0	[1],[6]	34	[2],[6]
Derivative liability positions, fair value	0		0
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Credit Risk Contract [Member] | Loans | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	477	[1],[6]	445	[2],[6]
Derivative liability positions, fair value	8	[1],[6]	8	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Credit Risk Contract [Member] | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	1,827	[1],[11],[6]	2,081	[12],[2],[6]
Derivative liability positions, fair value	52	[1],[11],[6]	49	[12],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Equity Contract | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	26,577	[1],[6],[9]	22,184	[10],[2],[6]
Derivative liability positions, fair value	1,820	[1],[6],[9]	1,529	[10],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Other Contract | Loans | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	347	[1],[13],[6]	142	[14],[2],[6]
Derivative liability positions, fair value	1	[1],[13],[6]	1	[14],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Nondesignated | Other Contract | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	239	[1],[6]	255	[2],[6]
Derivative liability positions, fair value	$ 30	[1],[6]	$ 29	[2],[6]

[1] The Company offsets cash collateral paid to and received from derivative counterparties when the derivative contracts are subject to master netting arrangements and meet the derivative offsetting requirements. The effects of offsetting on the Company's Consolidated Balance Sheets at March 31, 2013, are presented in Note 12, "Fair Value Election and Measurement." In some situations, trading derivatives are offset with derivatives used for risk management purposes that are recorded in other assets or other liabilities. As a result, the Company may reclass balances between trading assets or liabilities and other assets or other liabilities based on the predominant account.

[2] The Company offsets cash collateral paid to and received from derivative counterparties when the derivative contracts are subject to master netting arrangements and meet the derivative offsetting requirements. The effects of offsetting on the Company's Consolidated Balance Sheets as of December 31, 2011, are presented in Note 12, "Fair Value Election and Measurement."

[3] See “Cash Flow Hedges” in this Note for further discussion.

[4] See “Fair Value Hedges” in this Note for further discussion.

[5] See "Fair Value Hedges" in this Note for further discussion.

[6] See “Economic Hedging and Trading Activities” in this Note for further discussion.

[7] Amount includes $1.3 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[8] Amount includes $1.7 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative liability associated with the one day lag is included in the fair value column of this table.

[9] Amounts include $19.4 billion and $1.8 billion of notional related to interest rate futures and equity futures, respectively. These futures contracts settle in cash daily, one day in arrears. The derivative assets/liabilities associated with the one day lag are included in the fair value column of this table.

[10] Amounts include $16.2 billion and $0.8 billion of notional related to interest rate futures and equity futures, respectively. These futures contracts settle in cash daily, one day in arrears. The derivative asset associated with the one day lag is included in the fair value column of this table.

[11] Asset and liability amounts include $3 million and $4 million of notional from purchased and written credit risk participation agreements, respectively, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor.

[12] Asset and liability amounts each include $3 million of notional from purchased and written interest rate swap risk participation agreements, respectively, whose notional is calculated as the notional of the interest rate swap participated adjusted by the relevant RWA conversion factor.

[13] Includes a notional amount that is based on the number of Visa Class B shares, 3.2 million, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009 as discussed in Note 11, “Reinsurance Arrangements and Guarantees.” The fair value of the derivative liability, which relates to a notional amount of $134 million, is immaterial and is recognized in other liabilities in the Consolidated Balance Sheets.

[14] Includes a notional amount that is based on the number of Visa Class B shares, 3.2 million, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009 as discussed in Note 11, “Reinsurance Arrangements and Guarantees.” The fair value of the derivative liability, which relates to a notional amount of $134 million, is immaterial and is recognized in other liabilities in the Consolidated Balance Sheets