Loans to Banking Clients and Related Allowance for Loan Losses (Narrative) (Details) (USD $)			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 First Mortgage [Member]	Mar. 31, 2013 First Mortgage [Member]	Mar. 31, 2014 Home equity lines of credit [Member]	Mar. 31, 2013 Home equity lines of credit [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	$ 5,900,000,000	$ 5,700,000,000
Total nonaccrual loans	40,000,000	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	53,000,000
Purchased first mortgages and HELOCs			$ 286,000,000	$ 1,300,000,000	$ 172,000,000	$ 218,000,000