Derivative Instruments (Details 4) (USD $) In Millions	3 Months Ended		9 Months Ended
Derivative Instruments (Details 4) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Fair Value Hedges [Member] \| Interest Rate Contracts [Member] \| Other Noninterest Income Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	$ 1	$ 20	$ 25	$ (64)
Other Economic Hedges [Member] \| Futures and Forwards Interest Rate Contract [Member] \| Mortgage Banking Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	17	286	(7)	555
Other Economic Hedges [Member] \| Purchased and Written Options Interest Rate Contract [Member] \| Mortgage Banking Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	181	183	323	374
Purchased and Written Options Interest Rate Contract [Member] \| Other Noninterest Income Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings		1		1
Purchased and Written Options Foreign Exchange Rate Contract [Member] \| Commercial Products Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings		1		1
Other Economic Hedges [Member] \| Receive Fixed Pay Floating Swaps Interest Rate Contract [Member] \| Mortgage Banking Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	377		479
Receive Fixed Pay Floating Swaps Interest Rate Contract [Member] \| Other Noninterest Income Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	366	213	352	567
Other Economic Hedges [Member] \| Pay Fixed Receive Floating Swaps Interest Rate Contract [Member] \| Mortgage Banking Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	4		4
Pay Fixed Receive Floating Swaps Interest Rate Contract [Member] \| Other Noninterest Income Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	(376)	(216)	(365)	(565)
Fair Value Hedges [Member] \| Foreign exchange cross-currency swaps [Member] \| Other Noninterest Income Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	(111)	80	(13)	(151)
Forwards Spots and Swaps Foreign Exchange Contract [Member] \| Commercial Products Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	14	13	41	34
Other Economic Hedges [Member] \| Equity Contract [Member] \| Compensation Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	1	1	2	3
Other Economic Hedges [Member] \| Credit Risk Contract [Member] \| Other Noninterest Income Expense [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	4		2
Other Economic Hedges [Member] \| Foreign Exchange Forward Contract [Member] \| Commercial Products Revenue [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	$ (48)	$ (14)	$ (66)	$ (5)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.