Fair Value (Level 3 Total Realized And Unrealized Gains And Losses Recorded In Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Total Revenue [Member]
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	$ 14	$ 24	$ 32	$ 92
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(1)	5	(2)	14
Trading services
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	(1)	7	(1)	60
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(1)	5	(2)	14
Total fee revenue
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	(1)	7	(1)	60
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	(1)	5	(2)	14
Net interest revenue
Realized and Unrealized Gains and Losses [Line Items]
Total Realized and Unrealized Gains (Losses) Recorded in Revenue	15	17	33	32
Change in Unrealized Gains (Losses) Related to Financial Instruments Held	$ 0	$ 0	$ 0	$ 0