Credit Quality And Allowance For Credit Losses (Schedule Of Nonaccrual, Reduced-Rate Loans And Foreclosed Property) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Nonaccrual loans		$ 367	$ 273
Reduced-rate loans	[1]	12	17
Total nonperforming loans		379	290
Foreclosed property		12	10
Total nonperforming assets		391	300
Business loans
Reduced-rate loans		0	0
Retail loans
Nonaccrual loans		54	67
Reduced-rate loans		$ 12	$ 17

[1] There were no reduced-rate business loans at both December 31, 2015 and at December 31, 2014. Reduced-rate retail loans totaled $12 million and $17 million at December 31, 2015 and 2014, respectively.