Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

	June 30, 2015						December 31, 2014
	Cost		Unrealized Gain (Loss)		Fair Value		Cost		Unrealized Gain (Loss)		Fair Value
U.S. government securities	$	40	$	—	$	40	$	38	$	—	$	38
Corporate securities	42				42		36				36
Certificates of deposit	22				22		23				23
Other	60		5		65		67		5		72
Total marketable securities	$	164	$	5	$	169	$	164	$	5	$	169