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Investment Securities (Schedule Of Realized Gain (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Available-for-sale Securities [Abstract]        
Available-for-sale Securities, Gross Realized Gains $ 67 $ 68 $ 137 $ 165
Available-for-sale Securities, Gross Realized Losses (3) (4) (14) (12)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 0 0 (8) 0
Other gain (loss) on investments, net $ 64 $ 64 $ 115 $ 153