Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Revenues
Asset management and administration fees									$ 2,650	$ 2,533	$ 2,315
Net interest revenue									2,525	2,272	1,980
Trading revenue									866	907	913
Other									328	343	236
Provision for loan losses									11	4	1
Net impairment losses on securities										(1)	(10)
Total net revenues	$ 1,691	$ 1,597	$ 1,566	$ 1,526	$ 1,551	$ 1,551	$ 1,478	$ 1,478	6,380	6,058	5,435
Expenses Excluding Interest	$ 1,046	$ 1,014	$ 999	$ 1,042	997	$ 1,033	$ 957	$ 956	4,101	3,943	3,730
Income before taxes on income									2,279	2,115	1,705
Capital expenditures									285	405	270
Depreciation and amortization									224	199	202
Non-recurring revenue										45
Investor Services [Member]
Net Revenues
Asset management and administration fees									1,837	1,742	1,593
Net interest revenue									2,133	2,028	1,755
Trading revenue									556	606	609
Other									234	218	176
Provision for loan losses									11	4	1
Net impairment losses on securities										(1)	(9)
Total net revenues									4,771	4,597	4,125
Expenses Excluding Interest									3,090	2,937	2,858
Income before taxes on income									1,681	1,660	1,267
Capital expenditures									195	271	188
Depreciation and amortization									171	154	157
Advisor Services [Member]
Net Revenues
Asset management and administration fees									813	791	723
Net interest revenue									392	244	225
Trading revenue									310	301	304
Other									94	74	59
Net impairment losses on securities											(1)
Total net revenues									1,609	1,410	1,310
Expenses Excluding Interest									1,011	938	872
Income before taxes on income									598	472	438
Capital expenditures									90	134	82
Depreciation and amortization									$ 53	45	45
Unallocated [Member]
Net Revenues
Asset management and administration fees											(1)
Other										51	$ 1
Total net revenues										51
Expenses Excluding Interest										68
Income before taxes on income										(17)
Estimated severance benefits					$ 68					$ 68