Loans to Banking Clients and Related Allowance for Loan Losses (Delinquency Analysis by Loan Class) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 12,407		$ 10,699
30-59 days past due	6		31
60-89 days past due	6		4
>90 days past due and other nonaccrual loans	48		48
Total past due	60		83
Total loans	12,467	[1]	10,782	[1]
Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,808		6,291
30-59 days past due	3		22
60-89 days past due	4		2
>90 days past due and other nonaccrual loans	30		33
Total past due	37		57
Total loans	7,845		6,348
Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	154		154
30-59 days past due	1		1
>90 days past due and other nonaccrual loans	6		4
Total past due	7		5
Total loans	161		159
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,025		3,269
30-59 days past due	2		5
60-89 days past due	2		2
>90 days past due and other nonaccrual loans	12		11
Total past due	16		18
Total loans	3,041		3,287
Personal loans secured by securities [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,384		963
Total loans	1,384		963
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	36		22
30-59 days past due			3
Total past due			3
Total loans	$ 36		$ 25

[1] Loans are evaluated for impairment by loan segment.