Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Revenues
Net interest revenue	$ 1,681	$ 1,263
Other	102	83
Total net revenues	2,723	2,398
Expenses Excluding Interest	1,459	1,396
Income before taxes on income	1,264	1,002
Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue	755	851
Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	185	201
Investor Services [Member]
Net Revenues
Net interest revenue	1,195	957
Other	72	64
Total net revenues	1,911	1,741
Expenses Excluding Interest	1,062	1,042
Income before taxes on income	849	699
Investor Services [Member] | Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue	533	593
Investor Services [Member] | Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	111	127
Advisor Services [Member]
Net Revenues
Net interest revenue	486	306
Other	30	19
Total net revenues	812	657
Expenses Excluding Interest	397	354
Income before taxes on income	415	303
Advisor Services [Member] | Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue	222	258
Advisor Services [Member] | Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	$ 74	$ 74