Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities [Table Text Block]

	September 30, 2016						December 31, 2015
	Cost		Unrealized Gain (Loss)		Fair Value		Cost		Unrealized Gain (Loss)		Fair Value
U.S. government securities	$	34	$	—	$	34	$	38	$	—	$	38
Corporate securities	42				42		42				42
Certificates of deposit	24				24		18				18
Other	26				26		62		2		64
Total marketable securities	$	126	$	—	$	126	$	160	$	2	$	162