Loans to Banking Clients and Related Allowance for Loan Losses (Narrative) (Details) (USD $)			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 First Mortgage [Member]	Sep. 30, 2013 First Mortgage [Member]	Sep. 30, 2014 First Mortgage [Member]	Sep. 30, 2013 First Mortgage [Member]	Sep. 30, 2014 Home equity lines of credit [Member]	Sep. 30, 2013 Home equity lines of credit [Member]	Sep. 30, 2014 Home equity lines of credit [Member]	Sep. 30, 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	$ 6,300,000,000	$ 5,700,000,000
Purchased first mortgages and HELOCs			371,000,000	862,000,000	989,000,000	3,100,000,000	167,000,000	248,000,000	514,000,000	687,000,000
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