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Short-Term Borrowings (Securities Sold Under Repurchase Agreements) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Collateralized by securities purchased under resale agreements $ 1,454  
Collateralized by investment securities 6,499  
Total $ 7,953 $ 8,006