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):



Fair value measurement as of December 31, 2012, using:	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		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



Fair value measurement as of December 31, 2011, using:	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
Assets:
Available-for-sale investments:
U.S. Treasury securities	$	3,946	$	—	$	—	$	3,946
Other government-related debt securities:
U.S.	—		1,571		—		1,571
Foreign and other	—		450		—		450
Corporate debt securities:
Financial	—		2,508		—		2,508
Industrial	—		3,146		—		3,146
Other	—		289		—		289
Residential mortgage-backed securities	—		518		—		518
Other mortgage- and asset-backed securities	—		1,267		—		1,267
Money market mutual funds	6,266		—		—		6,266
Equity securities	42		—		—		42
Derivatives:
Foreign currency contracts	—		172		—		172
Interest rate swap contracts	—		377		—		377
Total assets	$	10,254	$	10,298	$	—	$	20,552
Liabilities:
Derivatives:
Foreign currency contracts	$	—	$	48	$	—	$	48
Cross-currency swap contracts	—		26		—		26
Contingent consideration obligations in connection with a business combination	—		—		190		190
Total liabilities	$	—	$	74	$	190	$	264