Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Assets Measured at Fair Value on a Recurring Basis

Assets measured at fair value on a recurring basis are summarized below (in millions):

			Fair Value Measurement at Reporting Date Using
Description	June 30, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	944	$	944	$	0	$	0
U.S. government securities		517		517		0		0
U.S. government agency securities		69		69		0		0
Marketable securities:
U.S. government securities		5,557		5,557		0		0
U.S. government agency securities		2,533		2,533		0		0
Total cash equivalents and marketable securities	$	9,620	$	9,620	$	0	$	0

			Fair Value Measurement at Reporting Date Using
Description	December 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	892	$	892	$	0	$	0
U.S. government securities		60		60		0		0
U.S. government agency securities		50		50		0		0
Marketable securities:
U.S. government securities		1,415		1,415		0		0
U.S. government agency securities		981		981		0		0
Total cash equivalents and marketable securities	$	3,398	$	3,398	$	0	$	0

Classification of Marketable Securities by Contractual Maturities

The following table classifies our marketable securities by contractual maturities as of June 30, 2012 (in millions):

	Fair Value
Due in one year	$	5,369
Due in one to two years		2,721
	$	8,090