. ( d ) represents the net notional amount of protection purchased and sold of single-name and portfolio credit derivatives used to manage both performing and nonperform- ing credit exposures ; these derivatives do not qualify for hedge accounting under u.s . gaap . for additional information , see credit derivatives on pages 126 2013128 , and note 6 on pages 191 2013199 of this annual report . ( e ) represents other liquid securities collateral and other cash collateral held by the firm