Derivative Positions (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Derivative Asset, Fair Value, Gross Asset	$ 6,621		$ 8,656
Derivative liability positions, fair value	5,938		7,514
Derivative Financial Instruments, Assets
Notional amount of derivatives	141,477	[1]	135,993	[2]
Derivative Asset, Fair Value, Gross Asset	6,621	[1]	8,656	[2]
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	(17,250)	[1],[3]	(17,350)	[2],[3]
Derivative Asset, Fair Value, Gross Asset	555	[1],[3]	771	[2],[3]
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	(2,000)	[1],[4]	(1,000)	[2],[5]
Derivative Asset, Fair Value, Gross Asset	50	[1],[4]	61	[2],[5]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member]
Derivatives not designated as hedging instruments, notional amount	122,227	[1],[6]	117,643	[2],[6]
Derivative Asset, Fair Value, Gross Asset	6,016	[1],[6]	7,824	[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Fixed Rate Debt | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	0		0
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	7,382	[1],[6]	6,185	[2],[6]
Derivative Asset, Fair Value, Gross Asset	57	[1],[6]	150	[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Loans | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	10,764	[1],[6],[7]	2,333	[2],[6],[8]
Derivative Asset, Fair Value, Gross Asset	294	[1],[6],[7]	6	[2],[6],[8]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	79,726	[1],[6],[9]	81,930	[10],[2],[6]
Derivative Asset, Fair Value, Gross Asset	3,705	[1],[6],[9]	6,044	[10],[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	2,381	[1],[6]	2,451	[2],[6]
Derivative Asset, Fair Value, Gross Asset	58	[1],[6]	66	[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	0		0
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Loans | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	0		0
Derivative Asset, Fair Value, Gross Asset	0		0
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	1,839	[1],[11],[6]	1,958	[12],[2],[6]
Derivative Asset, Fair Value, Gross Asset	32	[1],[11],[6]	55	[12],[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	17,781	[1],[6],[9]	15,748	[10],[2],[6]
Derivative Asset, Fair Value, Gross Asset	1,832	[1],[6],[9]	1,342	[10],[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Other Contract | Loans | Other Assets [Member]
Derivatives not designated as hedging instruments, notional amount	2,151	[1],[13],[6]	6,783	[14],[2],[6]
Derivative Asset, Fair Value, Gross Asset	23	[1],[13],[6]	132	[14],[2],[6]
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument [Member] | Other Contract | Trading Activity | Trading Account Assets [Member]
Derivatives not designated as hedging instruments, notional amount	203	[1],[6]	255	[2],[6]
Derivative Asset, Fair Value, Gross Asset	15	[1],[6]	29	[2],[6]
Derivative Financial Instruments, Liabilities [Member]
Notional amount of derivatives	124,860	[1]	133,283	[2]
Derivative liability positions, fair value	5,938	[1]	7,514	[2]
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 | Interest Rate Contract [Member] | Fixed Rate Debt | Trading Liabilities [Member]
Derivatives designated as hedging relationships, notional amount	(900)	[1],[4]	0
Derivative liability positions, fair value	12	[1],[4]	0
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivatives not designated as hedging instruments, notional amount	123,960	[1],[6]	133,283	[2],[6]
Derivative liability positions, fair value	5,926	[1],[6]	7,514	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | 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	7	[1],[6]	10	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Mortgage Servicing Rights [Member] | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	7,316	[1],[6]	12,643	[2],[6]
Derivative liability positions, fair value	132	[1],[6]	33	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Loans | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	6,494	[1],[6],[7]	7,076	[2],[6],[8]
Derivative liability positions, fair value	65	[1],[6],[7]	15	[2],[6],[8]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	76,436	[1],[6],[9]	86,037	[10],[2],[6]
Derivative liability positions, fair value	3,503	[1],[6],[9]	5,777	[10],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	2,055	[1],[6]	2,326	[2],[6]
Derivative liability positions, fair value	53	[1],[6]	63	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	32	[1],[6]	34	[2],[6]
Derivative liability positions, fair value	2	[1],[6]	0
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Loans | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	479	[1],[6]	445	[2],[6]
Derivative liability positions, fair value	7	[1],[6]	8	[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	1,918	[1],[11],[6]	2,081	[12],[2],[6]
Derivative liability positions, fair value	28	[1],[11],[6]	49	[12],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	25,107	[1],[6],[9]	22,184	[10],[2],[6]
Derivative liability positions, fair value	2,039	[1],[6],[9]	1,529	[10],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Other Contract | Loans | Other Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	3,860	[1],[13],[6]	142	[14],[2],[6]
Derivative liability positions, fair value	75	[1],[13],[6]	1	[14],[2],[6]
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Other Contract | Trading Activity | Trading Liabilities [Member]
Derivatives not designated as hedging instruments, notional amount	203	[1],[6]	255	[2],[6]
Derivative liability positions, fair value	$ 15	[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 June 30, 2013, are presented in Note 13, "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 at December 31, 2012, are presented in Note 13, "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 $2.3 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 $15.3 billion and $0.2 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 each include $3 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 12, “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 12, “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