4. Other Current Assets

Other current assets consisted of:

 

(in $ millions)		June 30, 2014				December 31, 2013
Restricted cash		$	35			$	44
Sales and use tax receivables			28				30
Prepaid expenses			21				22
Prepaid incentives			12				20
Derivative assets			1				3
Other			15				15
		$	112			$	134

Restricted cash represents cash held on behalf of clients for a short period of time before being transferred to travel industry partners. A compensating balance is held in accrued expenses and other current liabilities as customer prepayments.