Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Cash and cash equivalents or short-term or long-term marketable securities

The following tables present our cash and marketable securities’ costs, gross unrealized gains, gross unrealized losses and fair value by major security type recorded as cash and cash equivalents or short-term or long-term marketable securities:

	March 31, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
	(In millions)
Cash	$	537	$	—	$	—	$	537	$	537	$	—	$	—
Level 1:
Bank and time deposits	1,063		—		—		1,063		1,063		—		—
Money market funds	463		—		—		463		463		—		—
U.S. treasury and agency obligations	1,086		1		—		1,087		5		169		913
Subtotal	2,612		1		—		2,613		1,531		169		913
Level 2:
Commercial paper	188		—		—		188		166		22		—
Corporate bonds	1,566		3		—		1,569		20		485		1,064
Asset-backed securities and other	34		—		—		34		—		3		31
Subtotal	1,788		3		—		1,791		186		510		1,095
Level 3:
None	—		—		—		—		—		—		—
Total	$	4,937	$	4	$	—	$	4,941	$	2,254	$	679	$	2,008

	December 31, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Marketable Securities		Long-Term Marketable Securities
	(In millions)
Cash	$	307	$	—	$	—		$	307	$	307	$	—	$	—
Level 1:
Bank and time deposits	474		—		—			474		474		—		—
Money market funds	277		—		—			277		277		—		—
U.S. treasury and agency obligations	1,005		1		—			1,006		—		205		801
Subtotal	1,756		1		—			1,757		751		205		801
Level 2:
Commercial paper	690		—		—			690		599		91		—
Corporate bonds	1,591		3		(1		)	1,593		—		477		1,116
Asset-backed securities and other	24		—		—			24		—		2		22
Subtotal	2,305		3		(1		)	2,307		599		570		1,138
Level 3:
None	—		—		—			—		—		—		—
Total	$	4,368	$	4	$	(1	)	$	4,371	$	1,657	$	775	$	1,939