Derivative Instruments (Details 4) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Foreign exchange rate contracts [Member] | Forwards, spots and swaps [Member] | Customer-Related Positions [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	$ 13	$ 11	$ 27	$ 21
Other economic hedges [Member] | Foreign exchange forward contracts [Member] | Commercial products revenue [Member] | Asset and Liability Management Positions [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)	20	(18)	9
Other economic hedges [Member] | Interest rate contracts [Member] | Mortgage banking revenue [Member] | Futures and forwards [member] | Asset and Liability Management Positions [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	(10)	249	(24)	269
Other economic hedges [Member] | Interest rate contracts [Member] | Mortgage banking revenue [Member] | Purchased and written options [Member] | Asset and Liability Management Positions [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	93	121	142	191
Fair value hedges [Member] | Foreign exchange cross-currency swaps [Member] | Other noninterest income [Member] | Asset and Liability Management Positions [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	25	(161)	98	(231)
Fair value hedges [Member] | Interest rate contracts [Member] | Other noninterest income [Member] | Asset and Liability Management Positions [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	10	12	24	(84)
Interest rate contracts [Member] | Receive fixed/pay floating swaps [Member] | Customer-Related Positions [Member] | Other noninterest income [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	133	285	(14)	354
Interest rate contracts [Member] | Pay fixed/receive floating swaps [Member] | Customer-Related Positions [Member] | Other noninterest income [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings	(129)	(282)	11	(349)
Other economic hedges [Member] | Credit Risk Contract [Member] | Other noninterest income expense [Member] | Asset and Liability Management Positions [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)		(2)
Other economic hedges [Member] | Equity Contract [Member] | Compensation expense [Member] | Asset and Liability Management Positions [Member]
Summary of gains (losses) recognized in earnings for fair value hedges, other economic hedges and customer-related positions
Gains (Losses) Recognized in Earnings		$ 2	$ 1	$ 2