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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	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net derivative gain recognized in income	$ 60	$ 54
Interest Rate Contracts [Member] \| Other Noninterest Income [Member]
Net derivative gain recognized in income	22	15
Energy Contracts [Member] \| Other Noninterest Income [Member]
Net derivative gain recognized in income	3	1
Foreign Exchange Contracts [Member] \| Foreign Exchange Income [Member]
Net derivative gain recognized in income	$ 35	$ 38

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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