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Securities (Narrative) (Details) (USD $)	3 Months Ended				3 Months Ended
Securities (Narrative) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Fannie Mae Investment [Member]	Mar. 31, 2013 Freddie Mac Investment [Member]	Mar. 31, 2012 Covered Securities [Member] Non-Agency RMBS [Member]	Mar. 31, 2013 Covered Securities [Member] Non-Agency RMBS [Member]	Dec. 31, 2012 Covered Securities [Member] Non-Agency RMBS [Member]	Mar. 31, 2013 Covered Securities [Member] States and Political Subdivisions [Member]	Dec. 31, 2012 Covered Securities [Member] States and Political Subdivisions [Member]
Pledged securities carrying value	$ 18,800,000,000	$ 19,000,000,000
Securities, amortized cost			13,000,000,000	7,000,000,000
Securities, fair value			13,200,000,000	7,000,000,000		1,300,000,000	1,300,000,000	324,000,000	326,000,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net					4,000,000
Fair value hedge basis adjustments	$ 72,000,000

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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