Loans to Banking Clients and Related Allowance for Loan Losses (Narrative) (Details) (USD $)			3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 First Mortgage [Member]	Jun. 30, 2012 First Mortgage [Member]	Jun. 30, 2013 First Mortgage [Member]	Jun. 30, 2012 First Mortgage [Member]
Loans Receivable [Line Items]
Commitments to extend credit related to unused home equity lines of credit, personal loans secured by securities, and other lines of credit	$ 5,500,000,000	$ 5,400,000,000
Total nonaccrual loans	43,000,000	48,000,000
Loans accruing interest contractually 90 days or more past due	0	0
Nonperforming assets, including nonaccrual loans and other real estate owned	46,000,000	54,000,000
Purchased First Mortgages			$ 928,000,000,000	$ 515,000,000	$ 2,200,000,000	$ 586,000,000
Minimum fair value percentage of collateral to principal amount of loan	100.00%	100.00%