Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Revenues
Net interest revenue	$ 1,407	$ 1,053	$ 2,670	$ 2,053
Asset management and administration fees	814	845	1,665	1,668
Trading revenue	180	157	381	349
Other	85	75	168	141
Total net revenues	2,486	2,130	4,884	4,211
Expenses Excluding Interest	1,355	1,221	2,751	2,459
Income before taxes on income	1,131	909	2,133	1,752
Investor Services [Member]
Net Revenues
Net interest revenue	1,063	795	2,020	1,548
Asset management and administration fees	569	582	1,162	1,148
Trading revenue	115	98	242	217
Other	65	55	129	105
Total net revenues	1,812	1,530	3,553	3,018
Expenses Excluding Interest	1,012	914	2,054	1,844
Income before taxes on income	800	616	1,499	1,174
Advisor Services [Member]
Net Revenues
Net interest revenue	344	258	650	505
Asset management and administration fees	245	263	503	520
Trading revenue	65	59	139	132
Other	20	20	39	36
Total net revenues	674	600	1,331	1,193
Expenses Excluding Interest	343	307	697	615
Income before taxes on income	$ 331	$ 293	$ 634	$ 578