Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of Marketable Securities [Table Text Block]

	2015						2014
	Cost		Unrealized Gains (Losses)		Fair Value		Cost		Unrealized Gains (Losses)		Fair Value
U.S. government securities	$	38	$	—	$	38	$	38	$	—	$	38
Corporate securities	42				42		36				36
Certificates of deposit	18				18		23				23
Other	62		2		64		67		5		72
Total marketable securities	$	160	$	2	$	162	$	164	$	5	$	169