Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Nonaccrual loans	$ 329		$ 350
Reduced-rate loans	17	[1]	24	[1]
Total nonperforming loans	346		374
Foreclosed property	11		9
Total nonperforming assets	357		383
Business loans
Nonaccrual loans	255		262
Reduced-rate loans	0		4
Retail loans
Nonaccrual loans	74		88
Reduced-rate loans	$ 17		$ 20

[1] Reduced-rate business loans were zero at September 30, 2014 and $4 million at December 31, 2013, and reduced-rate retail loans were $17 million and $20 million at September 30, 2014 and December 31, 2013, respectively.