Loans to Banking Clients and Related Allowance for Loan Losses (Credit Quality of Residential Real Estate Mortgages and HELOCs by Reviewing FICO Scores at Origination, Current FICO Scores, Loan-To-Value Ratio) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	$ 12,910	[1]	$ 12,467	[1]
Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	7,892		7,845
Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	163		161
Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	8,055		8,006
Weighted Average Updated FICO	773		772
Percent of Loans that are on Nonaccrual Status	0.21%		0.26%
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,017		3,041
Weighted Average Updated FICO	769		769
Utilization Rate	39.00%	[2]	39.00%	[2]
Percent of Loans that are on Nonaccrual Status	0.19%		0.24%
Year of origination Pre 2010 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	774		859
Year of origination Pre 2010 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	51		55
Year of origination Pre 2010 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	825		914
Year of origination Pre 2010 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,196		2,304
Year of origination 2010 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	427		503
Year of origination 2010 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	7		7
Year of origination 2010 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	434		510
Year of origination 2010 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	182		191
Year of origination 2011 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	635		733
Year of origination 2011 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	35		38
Year of origination 2011 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	670		771
Year of origination 2011 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	149		155
Year of origination 2012 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,256		2,403
Year of origination 2012 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	26		26
Year of origination 2012 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,282		2,429
Year of origination 2012 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	153		162
Year of origination 2013 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,215		3,347
Year of origination 2013 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	35		35
Year of origination 2013 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,250		3,382
Year of origination 2013 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	253		229
Year of origination 2014 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	585
Year of origination 2014 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	9
Year of origination 2014 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	594
Year of origination 2014 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	84
Origination FICO Score Below 620 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	10		10
Origination FICO Score Below 620 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1		1
Origination FICO Score Below 620 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	11		11
Origination FICO Score 620 Through 679 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	90		96
Origination FICO Score 620 Through 679 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	12		14
Origination FICO Score 620 Through 679 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	102		110
Origination FICO Score 620 Through 679 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	19		20
Origination FICO Score 680 Through 739 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,338		1,352
Origination FICO Score 680 Through 739 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	32		32
Origination FICO Score 680 Through 739 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,370		1,384
Origination FICO Score 680 Through 739 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	564		576
Origination FICO Score 740 And Above [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,454		6,387
Origination FICO Score 740 And Above [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	118		114
Origination FICO Score 740 And Above [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,572		6,501
Origination FICO Score 740 And Above [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,434		2,445
Updated FICO Score Below 620 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	50		50
Updated FICO Score Below 620 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	5		5
Updated FICO Score Below 620 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	55		55
Updated FICO Score Below 620 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	39		42
Updated FICO Score 620 Through 679 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	183		209
Updated FICO Score 620 Through 679 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	7		10
Updated FICO Score 620 Through 679 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	190		219
Updated FICO Score 620 Through 679 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	104		106
Updated FICO Score 680 Through 739 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,063		1,012
Updated FICO Score 680 Through 739 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	27		29
Updated FICO Score 680 Through 739 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,090		1,041
Updated FICO Score 680 Through 739 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	456		453
Updated FICO Score 740 And Above [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,596		6,574
Updated FICO Score 740 And Above [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	124		117
Updated FICO Score 740 And Above [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,720		6,691
Updated FICO Score 740 And Above [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,418		2,440
Origination Loan To Value Ratio 70% And Below [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	5,362		5,306
Origination Loan To Value Ratio 70% And Below [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	113		110
Origination Loan To Value Ratio 70% And Below [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	5,475		5,416
Origination Loan To Value Ratio 70% And Below [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,019		2,040
Origination Loan to Value Ratio Greater Than 70% Through 90% [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,516		2,523
Origination Loan to Value Ratio Greater Than 70% Through 90% [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	44		45
Origination Loan to Value Ratio Greater Than 70% Through 90% [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,560		2,568
Origination Loan to Value Ratio Greater Than 70% Through 90% [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	975		977
Origination Loan to Value Ratio Greater Than 90% Through 100% [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	14		16
Origination Loan to Value Ratio Greater Than 90% Through 100% [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6		6
Origination Loan to Value Ratio Greater Than 90% Through 100% [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	20		22
Origination Loan to Value Ratio Greater Than 90% Through 100% [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	23		24
Estimated Current LTV 70% And Below [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,771		6,649
Weighted Average Updated FICO	775		775
Percent of Loans that are on Nonaccrual Status	0.06%		0.05%
Estimated Current LTV 70% And Below [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,154		2,127
Weighted Average Updated FICO	773		773
Utilization Rate	36.00%	[2]	36.00%	[2]
Percent of Loans that are on Nonaccrual Status	0.08%		0.13%
Estimated Current LTV Greater Than 70% through 90% [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,130		1,181
Weighted Average Updated FICO	765		763
Percent of Loans that are on Nonaccrual Status	0.37%		0.34%
Estimated Current LTV Greater Than 70% through 90% [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	652		664
Weighted Average Updated FICO	763		762
Utilization Rate	47.00%	[2]	48.00%	[2]
Percent of Loans that are on Nonaccrual Status	0.25%		0.22%
Estimated Current LTV Greater Than 90% through 100% [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	74		86
Weighted Average Updated FICO	738		732
Percent of Loans that are on Nonaccrual Status	2.21%		4.77%
Estimated Current LTV Greater Than 90% through 100% [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	110		127
Weighted Average Updated FICO	753		752
Utilization Rate	57.00%	[2]	59.00%	[2]
Percent of Loans that are on Nonaccrual Status	0.91%		1.22%
Estimated Current LTV Greater Than 100% [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	80		90
Weighted Average Updated FICO	734		730
Percent of Loans that are on Nonaccrual Status	8.08%		10.50%
Estimated Current LTV Greater Than 100% [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	$ 101		$ 123
Weighted Average Updated FICO	746		743
Utilization Rate	60.00%	[2]	63.00%	[2]
Percent of Loans that are on Nonaccrual Status	1.22%		1.34%

[1] All loans are evaluated for impairment by loan segment.

[2] The Utilization Rate is calculated using the outstanding HELOC balance divided by the associated total line of credit.