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	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Cash Flow Hedging
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 81		$ 684		$ 802
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(28)		423		487
Derivative Instruments, Gain (Loss) Recognized in Income, Net	6	[1]
Amount of gain on related Hedged Items recognized in Income	(6)	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	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	(171)	[2]	(46)		(101)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(365)		0		0
Cash Flow Hedging | Interest Rate Contract | Floating Rate Loans
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	252	[3]	730	[4]	903	[5]
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	337	[2]	423	[4]	487	[5]
Fair Value Hedging | Trading Account Profits And Commissions [Member] | Interest Rate Contract | Available-for-sale Securities [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	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 [Member] | Interest Rate Contract | Fixed Rate Debt
Derivative Instruments, Gain (Loss) Recognized in Income, Net	5	[1]	51	[1]
Amount of gain on related Hedged Items recognized in Income	(5)	[1]	(52)	[1]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	[1]	(1)	[1]
Nondesignated
Derivative Instruments, Gain (Loss) Recognized in Income, Net	1,134		779		767
Nondesignated | Trading Account Profits And Commissions [Member] | Equity Contract | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	8		(3)		(53)
Nondesignated | Trading Account Profits And Commissions [Member] | Interest Rate Contract | Fixed Rate Debt
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(2)		(5)		(64)
Nondesignated | Trading Account Profits And Commissions [Member] | Interest Rate Contract | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	86		113		304
Nondesignated | Trading Account Profits And Commissions [Member] | Interest Rate Contract | Corporate Bonds and Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net					(1)
Nondesignated | Trading Account Profits And Commissions [Member] | Foreign Exchange Contract | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	14		18		7
Nondesignated | Trading Account Profits And Commissions [Member] | Foreign Exchange Contract | Foreign-Denominated Debt and Commercial Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	129		(4)		(94)
Nondesignated | Trading Account Profits And Commissions [Member] | Credit Risk Contract [Member] | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(3)		(1)		(2)
Nondesignated | Trading Account Profits And Commissions [Member] | Credit Risk Contract [Member] | Trading Activity
Derivative Instruments, Gain (Loss) Recognized in Income, Net	24		15		10
Nondesignated | Other Income [Member] | Credit Risk Contract [Member] | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(8)
Nondesignated | Mortgage Servicing Income | Interest Rate Contract | Mortgage Servicing Rights [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	284		572		444
Nondesignated | Mortgage Production Income [Member] | Interest Rate Contract | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(331)		(281)		(176)
Nondesignated | Mortgage Production Income [Member] | Other Contract | Loans
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 930		$ 355		$ 392

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

[2] During the year ended December 31, 2012, the Company also recognized $60 million of pre-tax gains directly into net securities gains related to mark-to-market changes of the Coke hedging contracts when the cash flow hedging relationship failed to qualify for hedge accounting.

[3] During the year ended December 31, 2012, the Company also reclassified $171 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.

[4] During the year ended December 31, 2011, the Company also reclassified $202 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.

[5] During the year ended December 31, 2010, the Company also reclassified $130 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.