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Investment Securities (Schedule of Credit-Related Loss Activity Recognized In Earnings) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$ 124	$ 113
Plus losses for which other-than-temporary impairment was not previously recognized	14	2
Plus losses for which other-than-temporary impairment was previously recognized	6	25
Less previously recognized losses related to securities sold or matured	(10)	(21)
Ending balance	$ 134	$ 119

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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