Fair Value (Level 3 Total Realized And Unrealized Gains And Losses Recorded In Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Total Revenue [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	$ 28	$ 10	$ 57	$ 106
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	5	(1)	3	14
Trading services
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	8	(4)	4	60
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	5	(1)	3	14
Total fee revenue
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	8	(4)	4	60
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	5	(1)	3	14
Net interest revenue
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	20	14	53	46
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	$ 0	$ 0	$ 0	$ 0