

	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Fair value measurement
as of December 31, 2012, using:							Total
Assets:
Available-for-sale investments:
U.S. Treasury securities	$	4,458	$	—	$	—	$	4,458
Other government-related debt securities:
U.S.	—		1,030		—		1,030
Foreign and other	—		1,608		—		1,608
Corporate debt securities:
Financial	—		3,361		—		3,361
Industrial	—		4,380		—		4,380
Other	—		452		—		452
Residential mortgage-backed securities	—		1,829		—		1,829
Other mortgage- and asset-backed securities	—		1,767		—		1,767
Money market mutual funds	2,620		—		—		2,620
Other short-term interest-bearing securities	—		2,186		—		2,186
Equity securities	54		—		—		54
Derivatives:
Foreign currency contracts	—		46		—		46
Cross-currency swap contracts	—		65		—		65
Total assets	$	7,132	$	16,724	$	—	$	23,856
Liabilities:
Derivatives:
Foreign currency contracts	$	—	$	59	$	—	$	59
Cross-currency swap contracts	—		6		—		6
Contingent consideration obligations in connection with a business combination	—		—		221		221
Total liabilities	$	—	$	65	$	221	$	286

The fair value of each major class of the Company’s financial assets and liabilities measured at fair value on a recurring basis was as follows (in millions):



	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Fair value measurement
as of March 31, 2013, using:							Total
Assets:
Available-for-sale investments:
U.S. Treasury securities	$	2,707	$	—	$	—	$	2,707
Other government-related debt securities:
U.S.	—		1,019		—		1,019
Foreign and other	—		1,466		—		1,466
Corporate debt securities:
Financial	—		3,977		—		3,977
Industrial	—		4,457		—		4,457
Other	—		479		—		479
Residential mortgage-backed securities	—		1,817		—		1,817
Other mortgage- and asset-backed securities	—		1,497		—		1,497
Money market mutual funds	1,742		—		—		1,742
Other short-term interest-bearing securities	—		1,677		—		1,677
Equity securities	62		—		—		62
Derivatives:
Foreign currency contracts	—		108		—		108
Cross-currency swap contracts	—		8		—		8
Interest rate swap contracts	—		22		—		22
Total assets	$	4,511	$	16,527	$	—	$	21,038
Liabilities:
Derivatives:
Foreign currency contracts	$	—	$	21	$	—	$	21
Cross-currency swap contracts	—		72		—		72
Contingent consideration obligations in connection with a business combination	—		—		222		222
Total liabilities	$	—	$	93	$	222	$	315