Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Cash Flow Hedging
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (8)		$ (43)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	83		113
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	0	[1]
Amount of gain on related Hedged Items recognized in Income	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0
Cash Flow Hedging | Equity Contract | Available-for-sale Securities [Member]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(58)		(16)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0		0
Cash Flow Hedging | Interest Rate Contract | Floating Rate Loans
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	50	[2]	(27)	[3]
Cash Flow Hedging | Interest Income, Interest and Fees on Loans | Interest Rate Contract | Floating Rate Loans
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	83	[2]	113	[3]
Fair Value Hedging | Trading Account Profits and Commissions | Interest Rate Contract | Available-for-sale Securities [Member]
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	1	[1]
Amount of gain on related Hedged Items recognized in Income	(1)	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]
Fair Value Hedging | Trading Account Profits and Commissions | Interest Rate Contract | Fixed Rate Debt
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	(1)	[1]
Amount of gain on related Hedged Items recognized in Income	1	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]
Nondesignated
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	128		58
Nondesignated | Trading Account Profits and Commissions | Equity Contract | Trading Activity
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	4		3
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Fixed Rate Debt
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)			1
Nondesignated | Trading Account Profits and Commissions | Interest Rate Contract | Trading Activity
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	27		4
Nondesignated | Trading Account Profits and Commissions | Foreign Exchange Contract | Trading Activity
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	3		(1)
Nondesignated | Trading Account Profits and Commissions | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	15		81
Nondesignated | Trading Account Profits and Commissions | Credit Risk Contract | Loans
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	(3)		(1)
Nondesignated | Trading Account Profits and Commissions | Credit Risk Contract | Trading Activity
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	6		4
Nondesignated | Mortgage Servicing Income | Interest Rate Contract | Mortgage Servicing Rights
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	(73)		(43)
Nondesignated | Mortgage Production Income | Interest Rate Contract | Loans
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	(35)		(26)
Nondesignated | Mortgage Production Income | Other Contract | Loans
Amount of pre-tax gain/(loss) recognized in OCI on derivative (effective portion)	$ 184		$ 36

[1] Amounts are recognized in trading income in the Consolidated Statements of Income.

[2] During the three months ended March 31, 2012, the Company also reclassified $69 million in pre-tax gains from AOCI into net interest income. These gains related to hedging relationships that have been previously terminated or de-designated and are reclassified into earnings in the same period in which the forecasted transaction occurs.

[3] During the three months ended March 31, 2011, the Company also reclassified $41 million in pre-tax gains from AOCI into net interest income. These gains related to hedging relationships that have been previously terminated or de-designated and are reclassified into earnings in the same period in which the forecasted transaction occurs.