Credit Quality of Residential Real Estate Mortgages and HELOCs by Reviewing FICO Scores at Origination, Current FICO Scores, Loan-To-Value Ratio (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	$ 9,888	[1]	$ 9,866	[1]
Residential real estate mortgages, originated and purchased first mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	5,514	[2]
Residential real estate mortgages, originated and purchased first mortgages | Year of origination Pre 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	513
Residential real estate mortgages, originated and purchased first mortgages | Year of origination 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	464
Residential real estate mortgages, originated and purchased first mortgages | Year of origination 2009
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	415
Residential real estate mortgages, originated and purchased first mortgages | Year of origination 2010
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,374
Residential real estate mortgages, originated and purchased first mortgages | Year of origination 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,824
Residential real estate mortgages, originated and purchased first mortgages | Year of origination 2012
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	924
Residential real estate mortgages, originated and purchased first mortgages | Origination FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	10
Residential real estate mortgages, originated and purchased first mortgages | Origination FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	96
Residential real estate mortgages, originated and purchased first mortgages | Origination FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,029
Residential real estate mortgages, originated and purchased first mortgages | Origination FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	4,379
Residential real estate mortgages, originated and purchased first mortgages | Updated FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	55
Residential real estate mortgages, originated and purchased first mortgages | Updated FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	154
Residential real estate mortgages, originated and purchased first mortgages | Updated FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	857
Residential real estate mortgages, originated and purchased first mortgages | Updated FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	4,448
Residential real estate mortgages, originated and purchased first mortgages | Origination Loan To Value Ratio 70 Percent And Below
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,586	[2]
Residential real estate mortgages, originated and purchased first mortgages | Origination Loan to Value Ratio 71 Percent Through 89 Percent
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,903	[2]
Residential real estate mortgages, originated and purchased first mortgages | Origination Loan to Value Ratio 90 Percent And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	25	[2]
Residential real estate mortgages, other purchased first mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	160	[2]
Residential real estate mortgages, other purchased first mortgages | Year of origination Pre 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	58
Residential real estate mortgages, other purchased first mortgages | Year of origination 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	7
Residential real estate mortgages, other purchased first mortgages | Year of origination 2009
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	8
Residential real estate mortgages, other purchased first mortgages | Year of origination 2010
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	15
Residential real estate mortgages, other purchased first mortgages | Year of origination 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	68
Residential real estate mortgages, other purchased first mortgages | Year of origination 2012
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	4
Residential real estate mortgages, other purchased first mortgages | Origination FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2
Residential real estate mortgages, other purchased first mortgages | Origination FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	18
Residential real estate mortgages, other purchased first mortgages | Origination FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	42
Residential real estate mortgages, other purchased first mortgages | Origination FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	98
Residential real estate mortgages, other purchased first mortgages | Updated FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	6
Residential real estate mortgages, other purchased first mortgages | Updated FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	11
Residential real estate mortgages, other purchased first mortgages | Updated FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	37
Residential real estate mortgages, other purchased first mortgages | Updated FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	106
Residential real estate mortgages, other purchased first mortgages | Origination Loan To Value Ratio 70 Percent And Below
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	96	[2]
Residential real estate mortgages, other purchased first mortgages | Origination Loan to Value Ratio 71 Percent Through 89 Percent
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	55	[2]
Residential real estate mortgages, other purchased first mortgages | Origination Loan to Value Ratio 90 Percent And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	9	[2]
Residential real estate mortgages, originated first mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			5,437	[3]
Residential real estate mortgages, originated first mortgages | Year of origination Pre 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			569
Residential real estate mortgages, originated first mortgages | Year of origination 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			538
Residential real estate mortgages, originated first mortgages | Year of origination 2009
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			553
Residential real estate mortgages, originated first mortgages | Year of origination 2010
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			1,757
Residential real estate mortgages, originated first mortgages | Year of origination 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			2,020
Residential real estate mortgages, originated first mortgages | Origination FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			9
Residential real estate mortgages, originated first mortgages | Origination FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			108
Residential real estate mortgages, originated first mortgages | Origination FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			1,030
Residential real estate mortgages, originated first mortgages | Origination FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			4,290
Residential real estate mortgages, originated first mortgages | Updated FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			55
Residential real estate mortgages, originated first mortgages | Updated FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			162
Residential real estate mortgages, originated first mortgages | Updated FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			831
Residential real estate mortgages, originated first mortgages | Updated FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			4,389
Residential real estate mortgages, originated first mortgages | Origination Loan To Value Ratio 70 Percent And Below
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			3,507	[3]
Residential real estate mortgages, originated first mortgages | Origination Loan to Value Ratio 71 Percent Through 89 Percent
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			1,904	[3]
Residential real estate mortgages, originated first mortgages | Origination Loan to Value Ratio 90 Percent And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			26	[3]
Residential real estate mortgages, purchased first mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			159	[3]
Residential real estate mortgages, purchased first mortgages | Year of origination Pre 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			60
Residential real estate mortgages, purchased first mortgages | Year of origination 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			8
Residential real estate mortgages, purchased first mortgages | Year of origination 2009
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			10
Residential real estate mortgages, purchased first mortgages | Year of origination 2010
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			17
Residential real estate mortgages, purchased first mortgages | Year of origination 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			64
Residential real estate mortgages, purchased first mortgages | Origination FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			2
Residential real estate mortgages, purchased first mortgages | Origination FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			19
Residential real estate mortgages, purchased first mortgages | Origination FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			43
Residential real estate mortgages, purchased first mortgages | Origination FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			95
Residential real estate mortgages, purchased first mortgages | Updated FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			7
Residential real estate mortgages, purchased first mortgages | Updated FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			11
Residential real estate mortgages, purchased first mortgages | Updated FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			44
Residential real estate mortgages, purchased first mortgages | Updated FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			97
Residential real estate mortgages, purchased first mortgages | Origination Loan To Value Ratio 70 Percent And Below
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			91	[3]
Residential real estate mortgages, purchased first mortgages | Origination Loan to Value Ratio 71 Percent Through 89 Percent
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			60	[3]
Residential real estate mortgages, purchased first mortgages | Origination Loan to Value Ratio 90 Percent And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients			8	[3]
Residential real estate mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	5,674	[2]	5,596	[3]
Residential real estate mortgages | Year of origination Pre 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	571		629
Residential real estate mortgages | Year of origination 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	471		546
Residential real estate mortgages | Year of origination 2009
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	423		563
Residential real estate mortgages | Year of origination 2010
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,389		1,774
Residential real estate mortgages | Year of origination 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,892		2,084
Residential real estate mortgages | Year of origination 2012
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	928
Residential real estate mortgages | Origination FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	12		11
Residential real estate mortgages | Origination FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	114		127
Residential real estate mortgages | Origination FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,071		1,073
Residential real estate mortgages | Origination FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	4,477		4,385
Residential real estate mortgages | Updated FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	61		62
Residential real estate mortgages | Updated FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	165		173
Residential real estate mortgages | Updated FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	894		875
Residential real estate mortgages | Updated FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	4,554		4,486
Residential real estate mortgages | Origination Loan To Value Ratio 70 Percent And Below
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,682	[2]	3,598	[3]
Residential real estate mortgages | Origination Loan to Value Ratio 71 Percent Through 89 Percent
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,958	[2]	1,964	[3]
Residential real estate mortgages | Origination Loan to Value Ratio 90 Percent And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	34	[2]	34	[3]
Home equity lines of credit
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	3,408	[2]	3,509	[3]
Home equity lines of credit | Year of origination Pre 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,243		1,306
Home equity lines of credit | Year of origination 2008
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,212		1,262
Home equity lines of credit | Year of origination 2009
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	384		412
Home equity lines of credit | Year of origination 2010
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	289		311
Home equity lines of credit | Year of origination 2011
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	223		218
Home equity lines of credit | Year of origination 2012
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	57
Home equity lines of credit | Origination FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1
Home equity lines of credit | Origination FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	24		24
Home equity lines of credit | Origination FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	652		667
Home equity lines of credit | Origination FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,731		2,818
Home equity lines of credit | Updated FICO Score Below 620
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	45		49
Home equity lines of credit | Updated FICO Score 620 Through 679
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	105		112
Home equity lines of credit | Updated FICO Score 680 Through 739
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	516		520
Home equity lines of credit | Updated FICO Score 740 And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,742		2,828
Home equity lines of credit | Origination Loan To Value Ratio 70 Percent And Below
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	2,307	[2]	2,378	[3]
Home equity lines of credit | Origination Loan to Value Ratio 71 Percent Through 89 Percent
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	1,063	[2]	1,091	[3]
Home equity lines of credit | Origination Loan to Value Ratio 90 Percent And Above
Financing Receivable, Recorded Investment [Line Items]
Loans to banking clients	$ 38	[2]	$ 40	[3]

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

[2] The computation of the Origination LTV ratio for a HELOC includes any first lien mortgage outstanding on the same property at the time of origination. At June 30, 2012, $746 million of $3.4 billion in HELOCs were in a first lien position.

[3] The computation of the Origination LTV ratio for a HELOC includes any first lien mortgage outstanding on the same property at the time of origination. At December 31, 2011, $755 million of $3.5 billion in HELOCs were in a first lien position.