Segment Information (Financial Information for Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Net Revenues:
Asset management and administration fees	$ 572		$ 496		$ 1,124		$ 980
Net interest revenue	473		458		942		892
Trading revenue	235		219		458		462
Other	59	[1]	121	[1]	115	[1]	167	[1]
Provision for loan losses	1		(4)		(5)		(4)
Net impairment losses on securities	(3)	[2]	(7)	[2]	(7)	[2]	(25)	[2]
Total net revenues	1,337		1,283		2,627		2,472
Expenses Excluding Interest	925		851		1,884		1,727
Income before taxes on income	412		432		743		745
Taxes on income	156		157		281		275
Net Income	256		275		462		470
Pretax gain related to confidential resolution of a vendor dispute			70
Investor Services [Member]
Net Revenues:
Asset management and administration fees	402		350		789		691
Net interest revenue	418		407		831		791
Trading revenue	160		156		309		330
Other	43	[1]	29	[1]	85	[1]	61	[1]
Provision for loan losses	1		(3)		(4)		(3)
Net impairment losses on securities	(3)		(6)		(7)		(23)
Total net revenues	1,021		933		2,003		1,847
Expenses Excluding Interest	722		667		1,473		1,357
Income before taxes on income	299		266		530		490
Advisor Services [Member]
Net Revenues:
Asset management and administration fees	170		148		335		290
Net interest revenue	55		51		111		101
Trading revenue	75		63		149		132
Other	16	[1]	19	[1]	30	[1]	34	[1]
Provision for loan losses			(1)		(1)		(1)
Net impairment losses on securities			(1)				(2)
Total net revenues	316		279		624		554
Expenses Excluding Interest	203		184		411		370
Income before taxes on income	113		95		213		184
Unallocated [Member]
Net Revenues:
Asset management and administration fees			(2)				(1)
Other			73	[1]			72	[1]
Total net revenues			71				71
Income before taxes on income			$ 71				$ 71

[1] Unallocated amount includes a pre-tax gain of $70 million relating to a confidential resolution of a vendor dispute in the second quarter of 2012

[2] Net impairment losses on securities include total other-than-temporary impairment losses of $2 million and $12 million, net of $(1) million and $5 million reclassified from or recognized in other comprehensive income, for the three months ended June 30, 2013 and 2012, respectively. Net impairment losses on securities include total other-than-temporary impairment losses of $2 million and $14 million, net of $(5) million and $(11) million reclassified from other comprehensive income, for the six months ended June 30, 2013 and 2012, respectively