Investment Securities (Gains And Losses Related To Investment Securities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Investments, Debt and Equity Securities [Abstract]
Gross realized gains from sales of available-for-sale securities	$ 101		$ 152		$ 1,330
Gross realized losses from sales of available-for-sale securities	(46)	[1],[2]	(12)	[1],[2]	(1,385)	[1],[2]
Gross losses from other-than-temporary impairment	(53)		(123)		(651)
Losses not related to credit	21	[2]	50	[2]	420	[2]
Gains (losses) related to investment securities, net	23		67		(286)
Impairment associated with expected credit losses	(16)		(42)		(203)
Impairment Associated With Management's Intent To Sell The Impaired Securities Prior To Their Recovery In Value	0		(8)		(1)
Impairment associated with adverse changes in timing of expected future cash flows	(16)		(23)		(27)
Net impairment losses	$ (32)		$ (73)		$ (231)

[1] Amount for the year ended December 31, 2012 represented a loss that resulted from the sale of all of our Greek securities, which were previously classified as held to maturity. The sale was undertaken as a result of the effect of significant deterioration in the creditworthiness of the underlying collateral, including significant downgrades of the securities' published credit ratings.

[2] Amount for the year ended December 31, 2010 included a pre-tax net loss of approximately $344 million that resulted from a repositioning of our investment securities portfolio. In connection with the repositioning, which we undertook to enhance our regulatory capital ratios under evolving regulatory capital standards, increase our balance sheet flexibility in deploying our capital and reduce our exposure to certain asset classes, we sold approximately $11 billion of securities. The sale included approximately $4.8 billion of securities classified as held to maturity in our consolidated statement of condition, which was sold at a net pre-tax loss of $119 million, in response to changes in regulatory capital requirements and previous downgrades of the securities.