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Securities (Narrative) (Details) (USD $)	12 Months Ended
Securities (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2013
Pledged securities carrying value	$ 19,000,000,000	$ 11,900,000,000
Fair value hedge basis adjustments		60,000,000
FNMA Investment [Member]
Securities, amortized cost		13,200,000,000
Securities, fair value		12,700,000,000
FHLMC Investment [Member]
Securities, amortized cost		7,100,000,000
Securities, fair value		7,000,000,000
Covered Securities [Member] \| Non-Agency Mortgage-Backed Securities [Member]
Securities, fair value	1,300,000,000	1,100,000,000
OTTI losses, investments, portion recognized in earnings, net	4,000,000
Covered Securities [Member] \| States and Political Subdivisions [Member]
Securities, fair value	$ 326,000,000	$ 314,000,000

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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