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Federal Funds Sold and Securities Borrowed or Purchased Under Agreements to Resell (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Securities Purchased under Agreements to Resell [Abstract]    
Federal Funds Sold $ 58 $ 38
Securities Borrowed 270 277
Securities Purchased under Agreements to Resell 979 962
Federal Funds Sold and Securities Purchased under Agreements to Resell $ 1,307 $ 1,277