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Investment Securities (Schedule Of Realized Gain (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains	$ 70	$ 97
Available-for-sale Securities, Gross Realized Losses	(11)	(8)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	(8)	0
Other gain (loss) on investments, net	$ 51	$ 89

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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