Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used For Risk Management (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 | Forward Contracts | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	$ 4	$ (52)	$ (79)	$ (82)
Interest Rate Contract | Interest Rate Swap | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	3	1	4	2
Interest Rate Contract | Mortgage Servicing Rights | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	129	96	102	154
Foreign Exchange Contract | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings		2	(1)	1
Equity Contract | Warrants | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	28	9	25	7
Equity Contract | Put Option | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	2	1	1	1
Equity Contract | Swap | Other Noninterest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	$ (4)	$ 1	$ (13)	$ (9)