Receivables from Brokerage Clients (Narrative) (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Receivables from Brokerage Clients [Abstract]
Margin loans to brokerage clients	$ 12.8	$ 11.6
Average yield earned on margin loans	3.68%	4.08%