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Investment Securities (Schedule of Credit-Related Loss Activity Recognized in Earnings) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Investment Securities
Beginning balance	$ 63	$ 175
Plus expected credit-related losses for which other-than-temporary impairment was not previously recognized	7	72
Plus expected credit-related losses for which other-than-temporary impairment was previously recognized	31	78
Less losses realized for securities sold	(1)	(1)
Less losses related to securities intended or required to be sold	(2)
Ending balance	$ 98	$ 324

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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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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