Loans to Banking Clients and Related Allowance for Loan Losses (Delinquency Analysis by Loan Class) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 12,853		$ 12,407
30-59 days past due	16		6
60-89 days past due	4		6
>90 days past due and other nonaccrual loans	37		48
Total past due	57		60
Total loans	12,910	[1]	12,467	[1]
Residential real estate mortgages, first mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,856		7,808
30-59 days past due	10		3
60-89 days past due	3		4
>90 days past due and other nonaccrual loans	23		30
Total past due	36		37
Total loans	7,892		7,845
Residential real estate mortgages, purchased first mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	157		154
30-59 days past due	1		1
>90 days past due and other nonaccrual loans	5		6
Total past due	6		7
Total loans	163		161
Home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,003		3,025
30-59 days past due	4		2
60-89 days past due	1		2
>90 days past due and other nonaccrual loans	9		12
Total past due	14		16
Total loans	3,017		3,041
Personal loans secured by securities [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,803		1,384
30-59 days past due	1
Total past due	1
Total loans	1,804		1,384
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	34		36
Total loans	$ 34		$ 36

[1] All loans are evaluated for impairment by loan segment.