Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Nonaccrual loans	$ 326		$ 350
Reduced-rate loans	21	[1]	24	[1]
Total nonperforming loans	347		374
Foreclosed property	13		9
Total nonperforming assets	360		383
Retail loans
Nonaccrual loans	79		88
Reduced-rate loans	17		20
Business loans
Nonaccrual loans	247		262
Reduced-rate loans	$ 4		$ 4

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