Credit Quality of Residential Real Estate Mortgages and HELOCs by Reviewing FICO Scores at Origination, Current FICO Scores, Loan-To-Value Ratio (Parenthetical) (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]
Home equity lines of credit
Financing Receivable, Recorded Investment [Line Items]
Amount of home equity line of credit in a first lien position	746		755
Loans to banking clients	$ 3,408	[2]	$ 3,509	[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.