Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Credit Losses On Lending-Related Commitments) (Details) (Loan Origination Commitments, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Loan Origination Commitments
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 25	$ 32	$ 26	$ 35
Provision for credit losses on lending-related commitments	11	(2)	10	(5)
Balance at end of period	36	30	36	30
Unfunded lending-related commitments sold	$ 0	$ 3	$ 0	$ 5