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Federal Funds Sold and Securities Borrowed or Purchased Under Agreements to Resell Netting of financial instruments - repurchase agreements (parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets Sold under Agreements to Repurchase [Line Items]    
Federal Funds Sold $ 69 $ 29