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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for credit losses	$ 13	$ 19	$ 29	$ 41
Loan Origination Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	36	25	32	26
Provision for credit losses	0	11	4	10
Balance at end of period	$ 36	$ 36	$ 36	$ 36

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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