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				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 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)	$ 105	[1]	$ 124	[2]	$ 218	[1]	$ 251	[2]
Equity Contract | Available-for-Sale Securities | Cash Flow Hedging
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	6		106		(10)		167
Interest Rate Contract | Floating Rate Loans | Cash Flow Hedging
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	261		447		234		735
Cash Flow Hedging
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	267		553		224		902
Amount of pre-tax gain/(loss) reclassified from AOCI into income (effective portion)	105	[1]	124	[2]	218	[1]	251	[2]
Fair Value Hedging | Trading Account Profits and Commissions | Interest Rate Contract | Fixed Rate Debt
Amount of gain on Derivatives recognized in Income	15	[3]			15	[3]
Amount of gain on related Hedged Items recognized in Income	(15)	[3]			(15)	[3]
Amount of gain recognized in Income on Hedges (Ineffective Portion)		[3]				[3]
Nondesignated
Amount of gain on Derivatives recognized in Income	181		366		239		458
Nondesignated | Trading Account Profits and Commissions | Equity Contract
Amount of gain on Derivatives recognized in Income	5				8
Nondesignated | Trading Account Profits and Commissions | Equity Contract | Trading Activity
Amount of gain on Derivatives recognized in Income			(1)				6
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Fixed Rate Debt
Amount of gain on Derivatives recognized in Income			80		1		125
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	33				37		30
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Corporate Bonds and Loans
Amount of gain on Derivatives recognized in Income							(1)
Nondesignated | Trading Account Profits and Commissions | Foreign Exchange Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	(5)		19		(6)		26
Nondesignated | Trading Account Profits and Commissions | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans
Amount of gain on Derivatives recognized in Income	29		(107)		110		(202)
Nondesignated | Trading Account Profits and Commissions | Credit Risk Contract | Loans
Amount of gain on Derivatives recognized in Income			1		(1)		1
Nondesignated | Trading Account Profits and Commissions | Credit Risk Contract | Trading Activity
Amount of gain on Derivatives recognized in Income	4		3		8		4
Nondesignated | Mortgage Servicing Income | Interest Rate Contract | Mortgage Servicing Rights
Amount of gain on Derivatives recognized in Income	134		392		91		468
Nondesignated | Mortgage Production Income | Interest Rate Contract | Loans
Amount of gain on Derivatives recognized in Income	(67)		(140)		(93)		(210)
Nondesignated | Mortgage Production Income | Other Contract | Loans
Amount of gain on Derivatives recognized in Income	$ 48		$ 119		$ 84		$ 211

[1] During the three and six months ended June 30, 2011, the Company reclassified $49 million and $90 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 six months ended June 30, 2010, the Company reclassified $24 million and $53 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 recorded in trading account profits/(losses) and commissions in the Consolidated Statements of Income/(Loss).