Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Net Revenues
Net interest revenue		$ 1,572	$ 1,681
Other (1)	[1]	30	70
Total net revenues		2,617	2,723
Expenses Excluding Interest		1,570	1,459
Income before taxes on income		1,047	1,264
Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue		827	755
Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue	[1]	188	217
Investor Services [Member]
Net Revenues
Net interest revenue		1,128	1,195
Other (1)		20	42
Total net revenues		1,867	1,911
Expenses Excluding Interest		1,154	1,062
Income before taxes on income		713	849
Investor Services [Member] | Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue		600	533
Investor Services [Member] | Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue		119	141
Advisor Services [Member]
Net Revenues
Net interest revenue		444	486
Other (1)		10	28
Total net revenues		750	812
Expenses Excluding Interest		416	397
Income before taxes on income		334	415
Advisor Services [Member] | Asset management and administration fees [Member]
Net Revenues
Asset management and administration fees and Trading revenue		227	222
Advisor Services [Member] | Trading revenue [Member]
Net Revenues
Asset management and administration fees and Trading revenue		$ 69	$ 76

[1] 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.