Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Credit Losses On Lending-Related Commitments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses on lending-related commitments	$ 9	$ 8	$ 13	$ 16	$ 16	$ 22	$ 19	$ 22	$ 46	$ 79	$ 144
Loan Origination Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period				32				26	32	26	35
Provision for credit losses on lending-related commitments									4	6	(9)
Balance at end of period	$ 36				$ 32				$ 36	$ 32	$ 26