NOTE 2. CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES

Components for cash, cash equivalents and marketable securities (in millions):



December 31, 2014	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash	$	4	$	—	$	—		$	4
Cash equivalents	103		—		—			103
Cash and cash equivalents	107		—		—			107
U.S. government and agency securities	166		—		—			166
Foreign government bonds	25		—		—			25
Asset-backed securities	130		—		—			130
Mortgage-backed securities	127		—		(1		)	126
Corporate notes and bonds	644		3		(2		)	645
Municipal securities	18		—		—			18
Marketable securities	1,110		3		(3		)	1,110
Total	$	1,217	$	3	$	(3	)	$	1,217



December 31, 2013	Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Cash	$	9	$	—	$	—		$	9
Cash equivalents	71		—		—			71
Cash and cash equivalents	80		—		—			80
U.S. government and agency securities	295		1		(2		)	294
Foreign government bonds	11		—		—			11
Asset-backed securities	146		—		—			146
Mortgage-backed securities	144		1		(2		)	143
Corporate notes and bonds	628		4		(2		)	630
Municipal securities	26		—		—			26
Marketable securities	1,250		6		(6		)	1,250
Total	$	1,330	$	6	$	(6	)	$	1,330

Unrealized losses from fixed-income securities are primarily attributable to changes in interest rates. Management does not believe any remaining unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence as of December 31, 2014.

Activity for marketable securities (in millions):



	2014			2013			2012
Proceeds from sales and maturities	$	1,092		$	1,089		$	1,048
Gross realized gains	4			4			9
Gross realized losses	(2		)	(2		)	(2		)

Maturities for marketable securities (in millions):



December 31, 2014	Cost Basis		Fair Value
Due in one year or less	$	141	$	140
Due after one year through five years	958		959
Due after five years through 10 years	10		10
Due after 10 years	1		1
Total	$	1,110	$	1,110