Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Cash Flow Hedging
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 14,000,000		$ 267,000,000		$ 6,000,000		$ 224,000,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	83,000,000		105,000,000		166,000,000		218,000,000
Derivative Instruments, Gain (Loss) Recognized in Income, Net	8,000,000	[1]			8,000,000	[1]
Amount of gain on related Hedged Items recognized in Income	(8,000,000)	[1]			(8,000,000)	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]			0	[1]
Cash Flow Hedging | Equity Contract | Available-for-sale Securities [Member]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(103,000,000)		6,000,000		(161,000,000)		(10,000,000)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0		0		0		0
Cash Flow Hedging | Interest Rate Contract | Floating Rate Loans
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	117,000,000	[2]	261,000,000	[3]	167,000,000	[2]	234,000,000	[3]
Cash Flow Hedging | Interest Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	37,000,000		49,000,000		105,000,000		90,000,000
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	83,000,000	[2]	105,000,000	[3]	166,000,000	[2]	218,000,000	[3]
Fair Value Hedging | Other Income [Member] | Interest Rate Contract | Available-for-sale Securities [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0	[1]			1,000,000	[1]
Amount of gain on related Hedged Items recognized in Income	0	[1]			(1,000,000)	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]			0	[1]
Fair Value Hedging | Other Income [Member] | Interest Rate Contract | Fixed Rate Debt
Derivative Instruments, Gain (Loss) Recognized in Income, Net	8,000,000	[1]	15,000,000	[1]	7,000,000	[1]	15,000,000	[1]
Amount of gain on related Hedged Items recognized in Income	(8,000,000)	[1]	(15,000,000)	[1]	(7,000,000)	[1]	(15,000,000)	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]	0	[1]	0	[1]	0	[1]
Nondesignated
Derivative Instruments, Gain (Loss) Recognized in Income, Net	557,000,000		181,000,000		686,000,000		239,000,000
Nondesignated | Other Income [Member] | Equity Contract | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	10,000,000		5,000,000		13,000,000		8,000,000
Nondesignated | Other Income [Member] | Interest Rate Contract | Fixed Rate Debt
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(2,000,000)		0		(1,000,000)		1,000,000
Nondesignated | Other Income [Member] | Interest Rate Contract | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	27,000,000		33,000,000		54,000,000		37,000,000
Nondesignated | Other Income [Member] | Foreign Exchange Contract | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	11,000,000		(5,000,000)		14,000,000		(6,000,000)
Nondesignated | Other Income [Member] | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	115,000,000		29,000,000		130,000,000		110,000,000
Nondesignated | Other Income [Member] | Credit Risk Contract [Member] | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net			0		3,000,000		(1,000,000)
Nondesignated | Other Income [Member] | Credit Risk Contract [Member] | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	6,000,000		4,000,000		12,000,000		8,000,000
Nondesignated | Other Income [Member] | Credit Risk Contract [Member] | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(1,000,000)	[4]			(4,000,000)	[4]
Nondesignated | Mortgage Servicing Income | Interest Rate Contract | Mortgage Servicing Rights
Derivative Instruments, Gain (Loss) Recognized in Income, Net	269,000,000		134,000,000		196,000,000		91,000,000
Nondesignated | Mortgage Production Income | Interest Rate Contract | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(135,000,000)		(67,000,000)		(170,000,000)		(93,000,000)
Nondesignated | Mortgage Production Income | Other Contract | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 257,000,000		$ 48,000,000		$ 442,000,000		$ 84,000,000

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

[2] During the three and six months ended June 30, 2012, the Company also reclassified $37 million and $105 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 and are reclassified into earnings in the same period in which the forecasted transaction occurs.

[3] During the three and six months ended June 30, 2011, the Company also reclassified $49 million and $90 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.

[4] 1 For the six months ended June 30, 2012, losses of $3 million were recorded in trading income.