Fair Value Measurements (Tables)

Fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of December 31, 2017 and January 1, 2017 are as follows (in millions):



	December 31, 2017								January 1, 2017
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Money market funds (cash equivalent)	$	957	$	—	$	—	$	957	$	386	$	—	$	—	$	386
Debt securities in government-sponsored entities	—		67		—		67		—		34		—		34
Corporate debt securities	—		421		—		421		—		476		—		476
U.S. Treasury securities	432		—		—		432		314		—		—		314
Deferred compensation plan assets	—		35		—		35		—		31		—		31
Total assets measured at fair value	$	1,389	$	523	$	—	$	1,912	$	700	$	541	$	—	$	1,241
Liabilities:
Acquisition-related contingent consideration liabilities	$	—	$	—	$	—	$	—	$	—	$	—	$	4	$	4
Deferred compensation liability	—		33		—		33		—		29		—		29
Total liabilities measured at fair value	$	—	$	33	$	—	$	33	$	—	$	29	$	4	$	33

Changes in estimated fair value of contingent consideration liabilities from December 28, 2014 through December 31, 2017 are as follows (in millions):



	Contingent Consideration Liability (Level 3 Measurement)
Balance as of December 28, 2014	$	44
Change in estimated fair value, recorded in selling, general and administrative expenses	(6		)
Cash payments	(3		)
Balance as of January 3, 2016	35
Additional liability recorded as a result of a current period acquisition	5
Change in estimated fair value, recorded in selling, general and administrative expenses	(1		)
Cash payments	(35		)
Balance as of January 1, 2017	4
Change in estimated fair value, recorded in selling, general and administrative expenses	(1		)
Cash payments	(3		)
Balance as of December 31, 2017	$	—