Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used For Customer Accommodation (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest Rate Contract | Customer Contracts | Corporate Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	$ 7	$ 5	$ 15	$ 11
Interest Rate Contract | Allowance for Loan and Lease Losses (Member) | Noninterest Expense, Other
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	(10)	(5)	(12)	(7)
Interest Rate Contract | Fair Value Adjustments on Hedges and Derivative Contracts | Noninterest Expense, Other
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	3	(4)	10	(9)
Interest Rate Contract | Interest Rate Lock Commitments | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	31	72	55	108
Commodity Contract | Customer Contracts | Corporate Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	2	2	3	4
Commodity Contract | Fair Value Adjustments on Hedges and Derivative Contracts | Noninterest Expense, Other
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	1		1	1
Foreign Exchange Contract | Customer Contracts | Corporate Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	15	18	31	32
Foreign Exchange Contract | Fair Value Adjustments on Hedges and Derivative Contracts | Noninterest Expense, Other
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	$ 5		$ 1