Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities [Table Text Block]

	March 31, 2016						December 31, 2015
	Cost		Unrealized Gain (Loss)		Fair Value		Cost		Unrealized Gain (Loss)		Fair Value
U.S. government securities	$	37	$	—	$	37	$	38	$	—	$	38
Corporate securities	40				40		42				42
Certificates of deposit	23				23		18				18
Other	60		4		64		62		2		64
Total marketable securities	$	160	$	4	$	164	$	160	$	2	$	162