Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities [Table Text Block]

	June 30, 2016						December 31, 2015
	Cost		Unrealized Gain (Loss)		Fair Value		Cost		Unrealized Gain (Loss)		Fair Value
U.S. government securities	$	35	$	—	$	35	$	38	$	—	$	38
Corporate securities	39		1		40		42				42
Certificates of deposit	22				22		18				18
Other	63		4		67		62		2		64
Total marketable securities	$	159	$	5	$	164	$	160	$	2	$	162