Fair Value (Level 3 Total Realized and Unrealized Gains and Losses Recorded in Revenue) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Trading Services [Member]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	$ (18)	$ 24	$ (20)	$ 34
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(27)	23	(16)	20
Total Fee Revenue [Member]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	(18)	24	(20)	34
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(27)	23	(16)	20
Net Interest Revenue [Member]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	210	43	354	(75)
Change in Unrealized Gains (Losses) Related to Financial Instruments Held
Total Revenue [Member]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	192	67	334	(41)
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	$ (27)	$ 23	$ (16)	$ 20