Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Net Revenues
Net interest revenue	$ 1,389		$ 1,609		$ 2,961	$ 3,290
Other	67	[1]	79	[1]	97	149
Total net revenues	2,450		2,681		5,067	5,404
Expenses Excluding Interest	1,562		1,445		3,132	2,904
Income before taxes on income	888		1,236		1,935	2,500
Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue	801		786		1,628	1,541
Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	193	[1]	207	[1]	381	424
Investor Services [Member]
Net Revenues
Net interest revenue	952		1,154		2,080	2,349
Other	51		37		71	79
Total net revenues	1,724		1,891		3,591	3,802
Expenses Excluding Interest	1,168		1,057		2,322	2,119
Income before taxes on income	556		834		1,269	1,683
Investor Services [Member] | Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue	583		560		1,183	1,093
Investor Services [Member] | Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	138		140		257	281
Advisor Services [Member]
Net Revenues
Net interest revenue	437		455		881	941
Other	16		42		26	70
Total net revenues	726		790		1,476	1,602
Expenses Excluding Interest	394		388		810	785
Income before taxes on income	332		402		666	817
Advisor Services [Member] | Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue	218		226		445	448
Advisor Services [Member] | Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	$ 55		$ 67		$ 124	$ 143

[1] Beginning in the first quarter of 2020, order flow revenue was reclassified from other revenue to trading revenue. Prior period amounts have been reclassified to reflect this change.