Derivative Positions (Detail) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Derivative Financial Instruments, Assets
Notional amount of derivatives	$ 172,384	[1]	$ 190,372
Derivative asset positions	9,237	[1]	6,203
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Cash Flow Hedging
Derivatives designated as hedging relationships, notional amount	17,397	[1],[2]	16,897	[2]
Derivative asset positions	1,133	[1],[2]	947	[2]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Cash Flow Hedging | Equity Contract | Available-for-Sale Securities | Trading Account Assets
Derivatives designated as hedging relationships, notional amount	1,547	[1],[2]	1,547	[2]
Derivative asset positions	0	[1],[2]	0	[2]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract | Floating Rate Loans | Trading Account Assets
Derivatives designated as hedging relationships, notional amount	15,850	[1],[2]	15,350	[2]
Derivative asset positions	1,133	[1],[2]	947	[2]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Fair Value Hedging
Derivatives designated as hedging relationships, notional amount	1,000	[1],[3]
Derivative asset positions	59	[1],[3]
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Contract | Fixed Rate Debt | Trading Account Assets
Derivatives designated as hedging relationships, notional amount	1,000	[1],[3]
Derivative asset positions	59	[1],[3]
Derivative Financial Instruments, Assets | Nondesignated
Derivatives not designated as hedging instruments, notional amount	153,987	[1],[4]	173,475	[4]
Derivative asset positions	8,045	[1],[4]	5,256	[4]
Derivative Financial Instruments, Assets | Nondesignated | Future [Member]
Notional Amount of Interest Rate Derivatives	365		1,400
Notional related to equity futures	665
Derivative Financial Instruments, Assets | Nondesignated | Equity Contract | Trading Activity | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	7,924	[1],[4],[5]	5,010	[4],[6]
Derivative asset positions	853	[1],[4]	583	[4]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract | Fixed Rate Debt | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	437	[1],[4]	1,273	[4]
Derivative asset positions	21	[1],[4]	41	[4]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract | Mortgage Servicing Rights | Other Assets
Derivatives not designated as hedging instruments, notional amount	11,633	[1],[4]	20,474	[4]
Derivative asset positions	476	[1],[4]	152	[4]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract | Loans | Other Assets
Derivatives not designated as hedging instruments, notional amount	2,856	[1],[4],[7]	7,269	[4],[8]
Derivative asset positions	17	[1],[4]	92	[4]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract | Trading Activity | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	118,738	[1],[4],[5]	132,286	[4],[6]
Derivative asset positions	6,259	[1],[4]	4,211	[4]
Derivative Financial Instruments, Assets | Nondesignated | Interest Rate Contract | Corporate Bonds and Loans
Derivatives not designated as hedging instruments, notional amount			0	[4]
Derivative asset positions			0	[4]
Derivative Financial Instruments, Assets | Nondesignated | Foreign Exchange Contract | Trading Activity | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	4,297	[1],[4]	2,691	[4]
Derivative asset positions	239	[1],[4]	92	[4]
Derivative Financial Instruments, Assets | Nondesignated | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	1,088	[1],[4]	1,083	[4]
Derivative asset positions	19	[1],[4]	17	[4]
Derivative Financial Instruments, Assets | Nondesignated | Credit Risk Contract | Loans | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	50	[1],[4]	15	[4]
Derivative asset positions	1	[1],[4]	0	[4]
Derivative Financial Instruments, Assets | Nondesignated | Credit Risk Contract | Trading Activity | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	1,775	[1],[4],[9]	1,094	[10],[4]
Derivative asset positions	59	[1],[4]	39	[4]
Derivative Financial Instruments, Assets | Nondesignated | Other Contract | Loans | Other Assets
Derivatives not designated as hedging instruments, notional amount	4,993	[1],[4]	2,169	[4]
Derivative asset positions	79	[1],[4]	18	[4]
Derivative Financial Instruments, Assets | Nondesignated | Other Contract | Trading Activity | Trading Account Assets
Derivatives not designated as hedging instruments, notional amount	196	[1],[4]	111	[4]
Derivative asset positions	22	[1],[4]	11	[4]
Derivative Financial Instruments, Liabilities
Notional amount of derivatives	132,070	[1]	131,799
Derivative liability positions, fair value	7,396	[1]	5,174
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Cash Flow Hedging
Derivatives designated as hedging relationships, notional amount	1,547	[1],[2]	2,047	[2]
Derivative liability positions, fair value	146	[1],[2]	155	[2]
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Cash Flow Hedging | Equity Contract | Available-for-Sale Securities | Trading Liabilities
Derivatives designated as hedging relationships, notional amount	1,547	[1],[2]	1,547	[2]
Derivative liability positions, fair value	146	[1],[2]	145	[2]
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract | Floating Rate Loans | Trading Liabilities
Derivatives designated as hedging relationships, notional amount	0	[1],[2]	500	[2]
Derivative liability positions, fair value	0	[1],[2]	10	[2]
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Fair Value Hedging
Derivatives designated as hedging relationships, notional amount	0	[1],[3]
Derivative liability positions, fair value	0	[1],[3]
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Contract | Fixed Rate Debt | Trading Liabilities
Derivatives designated as hedging relationships, notional amount	0	[1],[3]
Derivative liability positions, fair value	0	[1],[3]
Derivative Financial Instruments, Liabilities | Nondesignated
Derivatives not designated as hedging instruments, notional amount	130,523	[1],[4]	129,752	[4]
Derivative liability positions, fair value	7,250	[1],[4]	5,019	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Equity Contract | Trading Activity | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	9,504	[1],[4]	8,012	[4]
Derivative liability positions, fair value	876	[1],[4]	730	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Interest Rate Contract | Fixed Rate Debt | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	60	[1],[4]	60	[4]
Derivative liability positions, fair value	10	[1],[4]	4	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Interest Rate Contract | Mortgage Servicing Rights | Other Liabilities
Derivatives not designated as hedging instruments, notional amount	9,860	[1],[4]	6,480	[4]
Derivative liability positions, fair value	46	[1],[4]	73	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Interest Rate Contract | Loans | Other Liabilities
Derivatives not designated as hedging instruments, notional amount	5,354	[1],[4]	2,383	[4]
Derivative liability positions, fair value	43	[1],[4]	20	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Interest Rate Contract | Trading Activity | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	98,866	[1],[4]	105,926	[4]
Derivative liability positions, fair value	5,831	[1],[4]	3,884	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Interest Rate Contract | Corporate Bonds and Loans | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount			5	[4]
Derivative liability positions, fair value			0	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Foreign Exchange Contract | Trading Activity | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	4,184	[1],[4]	2,818	[4]
Derivative liability positions, fair value	229	[1],[4]	91	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	496	[1],[4]	495	[4]
Derivative liability positions, fair value	125	[1],[4]	128	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Credit Risk Contract | Loans | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	192	[1],[4]	227	[4]
Derivative liability positions, fair value	2	[1],[4]	2	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Credit Risk Contract | Trading Activity | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	1,538	[1],[4],[9]	1,039	[4]
Derivative liability positions, fair value	50	[1],[4]	34	[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Other Contract | Loans | Other Liabilities
Derivatives not designated as hedging instruments, notional amount	279	[1],[11],[4]	2,196	[12],[4]
Derivative liability positions, fair value	16	[1],[11],[4]	42	[12],[4]
Derivative Financial Instruments, Liabilities | Nondesignated | Other Contract | Trading Activity | Trading Liabilities
Derivatives not designated as hedging instruments, notional amount	190	[1],[4]	111	[4]
Derivative liability positions, fair value	22	[1],[4]	11	[4]
Credit Default Swap [Member]
Fair values of written CDS	$ 9.0		$ 1.0

[1] As of July 1, 2011, the Company began offsetting cash collateral paid to and received from derivative counterparties when the derivative contracts are subject to ISDA master netting arrangements and meet the derivatives accounting requirements of ASC 815-10, "Derivatives and Hedging." The effects of offsetting on the Company's Consolidated Balance Sheets as of September 30, 2011 are presented in Note 12, "Fair Value Election and Measurement."

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

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

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

[5] Amounts include $19.3 billion and $428 million of notional related to interest rate futures and equity futures, respectively. These futures contracts settle in cash daily and therefore no derivative asset or liability is recognized.

[6] Amounts include $25.0 billion and $0.5 billion of notional related to interest rate futures and equity futures, respectively. These futures contracts settle in cash daily and therefore no derivative asset or liability is recognized.

[7] Amounts include $365 million and $665 million of notional amounts related to interest rate futures and equity futures, respectively. These futures contracts settle in cash daily and therefore no derivative asset or liability is recognized.

[8] Amount includes $1.4 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily and therefore no derivative asset or liability is recognized.

[9] Asset and liability amounts include $1 million and $6 million, respectively, of notional from purchased and written credit risk participation agreements, respectively, which notional is calculated as the notional of the derivative participated adjusted by the relevant risk weighted assets conversion factor.

[10] Asset and liability amounts include $1 million and $8 million, respectively, of notional from purchased and written interest rate swap risk participation agreements, respectively, which notional is calculated as the notional of the interest rate swap participated adjusted by the relevant risk weighted assets conversion factor.

[11] Includes a $16 million derivative liability recognized in other liabilities in the Consolidated Balance Sheets, related to a notional amount of $134 million. The notional amount is based on the number of Visa Class B shares, 3.2 million, the conversion ratio from Visa Class B common stock to Visa Class A common stock, and the Visa Class A common stock price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Visa Class B shares in the second quarter of 2009 as discussed in Note 18, “Reinsurance Arrangements and Guarantees,” to the Consolidated Financial Statements in the Company’s 2010 Annual Report on Form 10-K.

[12] Includes a $23 million derivative liability recognized in other liabilities in the Consolidated Balance Sheets, related to a notional amount of $134 million. The notional amount is based on the number of Visa Class B shares, 3.2 million, the conversion ratio from Visa Class B common stock to Visa Class A common stock, and the Visa Class A common stock price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Visa Class B shares in the second quarter of 2009 as discussed in Note 18, “Reinsurance Arrangements and Guarantees,” to the Consolidated Financial Statements in the Company’s 2010 Annual Report on Form 10-K.