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Derivative And Credit-Related Financial Instruments (Schedule Of Net Gains Recognized In Income On Customer-Initiated Derivatives) (Details) (Not Designated as Hedging Instrument [Member], Customer-Initiated And Other Activities [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net derivative gain recognized in income $ 16 $ 17 $ 29 $ 29
Interest Rate Contracts [Member] | Other Noninterest Income [Member]
       
Net derivative gain recognized in income 6 7 9 9
Energy Contracts [Member] | Other Noninterest Income [Member]
       
Net derivative gain recognized in income 1 1 2 2
Foreign Exchange Contracts [Member] | Foreign Exchange Income [Member]
       
Net derivative gain recognized in income $ 9 $ 9 $ 18 $ 18