.0 billion and $ 635.6 billion , respectively . this collateral was generally obtained under resale agreements , securities borrowing agreements , cus- tomer margin loans and derivative agreements . of the collateral received , approximately $ 521.3 billion and $ 472.7 billion were sold or repledged , generally as collateral under repurchase agreements , securities lending agreements or to cover short sales and to collat- eralize deposits and derivative agreements