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	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	$ 13,120	[1]	$ 12,467	[1]
Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	7,916		7,845
Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	159		161
Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	8,075		8,006
Weighted Average Updated FICO	774		772
Percent of Loans that are on Nonaccrual Status	0.23%		0.26%
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,982		3,041
Weighted Average Updated FICO	770		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	731		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	49		55
Year of origination Pre 2010 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	780		914
Year of origination Pre 2010 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,131		2,304
Year of origination 2010 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	392		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	399		510
Year of origination 2010 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	175		191
Year of origination 2011 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	588		733
Year of origination 2011 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	33		38
Year of origination 2011 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	621		771
Year of origination 2011 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	143		155
Year of origination 2012 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,167		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	25		26
Year of origination 2012 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,192		2,429
Year of origination 2012 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	150		162
Year of origination 2013 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,109		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	34		35
Year of origination 2013 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,143		3,382
Year of origination 2013 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	248		229
Year of origination 2014 [Member] | Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	929
Year of origination 2014 [Member] | Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	11
Year of origination 2014 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	940
Year of origination 2014 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	135
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	88		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	11		14
Origination FICO Score 620 Through 679 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	99		110
Origination FICO Score 620 Through 679 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	18		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	1,336		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	31		32
Origination FICO Score 680 Through 739 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,367		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	557		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	6,482		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	116		114
Origination FICO Score 740 And Above [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,598		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	2,407		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	46		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	4		5
Updated FICO Score Below 620 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	50		55
Updated FICO Score Below 620 [Member] | Home equity lines of credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	37		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	175		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	182		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	1,022		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	26		29
Updated FICO Score 680 Through 739 [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,048		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	444		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	6,673		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	122		117
Updated FICO Score 740 And Above [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6,795		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	2,397		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	5,401		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	111		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	5,512		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	1,996		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	2,501		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	2,545		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	964		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	4		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	18		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	22		24
Estimated Current LTV 70% And Below [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	7,138		6,649
Weighted Average Updated FICO	776		775
Percent of Loans that are on Nonaccrual Status	0.08%		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	2,346		2,127
Weighted Average Updated FICO	773		773
Utilization Rate	37.00%	[2]	36.00%	[2]
Percent of Loans that are on Nonaccrual Status	0.05%		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	829		1,181
Weighted Average Updated FICO	764		763
Percent of Loans that are on Nonaccrual Status	0.58%		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	499		664
Weighted Average Updated FICO	762		762
Utilization Rate	49.00%	[2]	48.00%	[2]
Percent of Loans that are on Nonaccrual Status	0.49%		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	52		86
Weighted Average Updated FICO	737		732
Percent of Loans that are on Nonaccrual Status	1.79%		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	74		127
Weighted Average Updated FICO	750		752
Utilization Rate	62.00%	[2]	59.00%	[2]
Percent of Loans that are on Nonaccrual Status	1.24%		1.22%
Estimated Current LTV Greater Than 100% [Member] | Residential real estate mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	56		90
Weighted Average Updated FICO	724		730
Percent of Loans that are on Nonaccrual Status	13.21%		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	$ 63		$ 123
Weighted Average Updated FICO	740		743
Utilization Rate	64.00%	[2]	63.00%	[2]
Percent of Loans that are on Nonaccrual Status	2.02%		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.