Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Revenues
Asset management and administration fees	[1]	$ 861	$ 798	$ 2,529	$ 2,254
Net interest revenue		1,082	845	3,135	2,415
Trading revenue		151	190	500	623
Other		71	76	212	209
Provision for loan losses		0	5	0	5
Total net revenues		2,165	1,914	6,376	5,506
Expenses Excluding Interest		1,220	1,120	3,679	3,337
Income before taxes on income		945	794	2,697	2,169
Investor Services [Member]
Net Revenues
Asset management and administration fees		595	550	1,743	1,536
Net interest revenue		818	654	2,366	1,895
Trading revenue		94	123	311	395
Other		54	56	159	153
Provision for loan losses		0	4	0	4
Total net revenues		1,561	1,387	4,579	3,983
Expenses Excluding Interest		918	847	2,762	2,518
Income before taxes on income		643	540	1,817	1,465
Advisor Services [Member]
Net Revenues
Asset management and administration fees		266	248	786	718
Net interest revenue		264	191	769	520
Trading revenue		57	67	189	228
Other		17	20	53	56
Provision for loan losses		0	1	0	1
Total net revenues		604	527	1,797	1,523
Expenses Excluding Interest		302	273	917	819
Income before taxes on income		$ 302	$ 254	$ 880	$ 704

[1] Includes the effect of fee waivers of $1 million and $41 million during the third quarters of 2017 and 2016, respectively, and $10 million and $193 million during the first nine months of 2017 and 2016, respectively, relating to Schwab-sponsored money market funds.