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Investment Securities (Schedule Of Credit-Related Loss Activity Recognized In Earnings) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Investments, All Other Investments [Abstract]
Beginning balance	$ 113	$ 63
Plus expected credit-related losses for which other-than-temporary impairment was not previously recognized	1	3
Plus expected credit-related losses for which other-than-temporary impairment was previously recognized	7	8
Less losses realized for securities sold	(20)	0
Ending balance	$ 101	$ 74

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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