Marketable Securities

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Marketable Securities



	March 31, 2018						December 31, 2017
	Cost		Unrealized Gain (Loss)		Fair Value		Cost		Unrealized Gain (Loss)		Fair Value
U.S. government securities	$	3	$	—	$	3	$	3	$	—	$	3
Corporate securities	5				5		5				5
Certificates of deposit	28				28		27				27
Other	5				5		4		1		5
Total marketable securities	$	41	$	—	$	41	$	39	$	1	$	40

U.S. government securities include bonds issued by government-sponsored agencies and Treasury notes. Corporate securities are primarily debt securities. Other consists of investments in mutual and index funds. U.S. government securities, corporate debt and certificates of deposit maturing in one year or less, after one year through five years and after five years through ten years total $29, $4 and $3 at March 31, 2018.