Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) - Not Designated as Hedging Instrument - Customer-Initiated And Other Activities - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Net derivative gain recognized in income	$ 55	$ 60
Interest Rate Contracts | Other Noninterest Income
Net derivative gain recognized in income	16	20
Energy Contracts | Other Noninterest Income
Net derivative gain recognized in income	2	2
Foreign Exchange Contracts | Foreign Exchange Income
Net derivative gain recognized in income	$ 37	$ 38