Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Interest Income, Interest and Fees on Loans | Interest Rate Contract | Floating Rate Loans | Cash Flow Hedging
Amount of pre-tax gain/(loss) reclassified from AOCI into income (effective portion)	$ 103	[1]	$ 119	[2]	$ 321	[1]	$ 370	[2]
Equity Contract | Available-for-Sale Securities | Cash Flow Hedging
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	8		(125)		(2)		42
Amount of pre-tax gain/(loss) reclassified from AOCI into income (effective portion)	0	[1]	0	[2]	0	[1]	0	[2]
Interest Rate Contract | Floating Rate Loans | Cash Flow Hedging
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	438		380		673		1,115
Cash Flow Hedging
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	446		255		671		1,157
Amount of pre-tax gain/(loss) reclassified from AOCI into income (effective portion)	103	[1]	119	[2]	321	[1]	370	[2]
Fair Value Hedging | Trading Account Profits and Commissions | Interest Rate Contract | Fixed Rate Debt
Amount of gain on Derivatives recognized in Income	35	[3]			49	[3]
Amount of gain on related Hedged Items recognized in Income	(35)	[3]			(50)	[3]
Amount of gain recognized in Income on Hedges (Ineffective Portion)	0	[3]			(1)	[3]
Nondesignated
Amount of gain on Derivatives recognized in Income	369		511		598		968
Nondesignated | Trading Account Profits and Commissions | Equity Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	(9)		(62)		(1)		(56)
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Fixed Rate Debt
Amount of gain on Derivatives recognized in Income	(5)		(194)		(4)		(68)
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	41		256		78		285
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Corporate Bonds and Loans
Amount of gain on Derivatives recognized in Income			0				(1)
Nondesignated | Trading Account Profits and Commissions | Foreign Exchange Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	20		(20)		13		5
Nondesignated | Trading Account Profits and Commissions | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans
Amount of gain on Derivatives recognized in Income	(96)		133		15		(69)
Nondesignated | Trading Account Profits and Commissions | Credit Risk Contract | Loans
Amount of gain on Derivatives recognized in Income	0		(1)		(1)		0
Nondesignated | Trading Account Profits and Commissions | Credit Risk Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	6		2		14		6
Nondesignated | Mortgage Servicing Income | Interest Rate Contract | Mortgage Servicing Rights
Amount of gain on Derivatives recognized in Income	397		315		488		783
Nondesignated | Mortgage Production Income | Interest Rate Contract | Loans
Amount of gain on Derivatives recognized in Income	(130)		(82)		(233)		(292)
Nondesignated | Mortgage Production Income | Other Contract | Loans
Amount of gain on Derivatives recognized in Income	$ 145		$ 164		$ 229		$ 375

[1] During the three and nine months ended September 30, 2011, the Company reclassified $56 million and $146 million, respectively, in pre-tax gains from AOCI into net interest income. These gains related to hedging relationships that have been previously terminated or de-designated.

[2] During the three and nine months ended September 30, 2010, the Company reclassified $35 million and $88 million, respectively, in pre-tax gains from AOCI into net interest income. These gains related to hedging relationships that have been previously terminated or de-designated.

[3] Amounts are recognized in trading account profits/(losses) and commissions in the Consolidated Statements of Income.