Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Revenues
Net interest revenue	$ 1,263	$ 1,000
Asset management and administration fees	851	823
Trading revenue	201	192
Other	83	66
Total net revenues	2,398	2,081
Expenses Excluding Interest	1,396	1,238
Income before taxes on income	1,002	843
Investor Services [Member]
Net Revenues
Net interest revenue	957	753
Asset management and administration fees	593	566
Trading revenue	127	119
Other	64	50
Total net revenues	1,741	1,488
Expenses Excluding Interest	1,042	930
Income before taxes on income	699	558
Advisor Services [Member]
Net Revenues
Net interest revenue	306	247
Asset management and administration fees	258	257
Trading revenue	74	73
Other	19	16
Total net revenues	657	593
Expenses Excluding Interest	354	308
Income before taxes on income	$ 303	$ 285