Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Revenues:
Asset management and administration fees	$ 823	$ 699
Net interest revenue	1,000	772
Trading revenue	192	232
Other	66	63
Provision for loan losses	0	(2)
Total net revenues	2,081	1,764
Expenses Excluding Interest	1,238	1,109
Income before taxes on income	843	655
Investor Services [Member]
Net Revenues:
Asset management and administration fees	566	472
Net interest revenue	753	613
Trading revenue	119	143
Other	50	46
Provision for loan losses	0	(2)
Total net revenues	1,488	1,272
Expenses Excluding Interest	930	836
Income before taxes on income	558	436
Advisor Services [Member]
Net Revenues:
Asset management and administration fees	257	227
Net interest revenue	247	159
Trading revenue	73	89
Other	16	17
Provision for loan losses	0	0
Total net revenues	593	492
Expenses Excluding Interest	308	273
Income before taxes on income	$ 285	$ 219