Fair value measurement (Tables)

12 Months Ended

Dec. 31, 2011

Fair value measurement [Abstract]

Fair value of each major class of financial assets and liabilities measured at fair value on a recurring basis

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:
Obligations of U.S. government agencies and FDIC-guaranteed bank debt		—		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
Mortgage- and asset-backed securities		—		1,785		—		1,785
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

Fair value measurement as of December 31, 2010, 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	$	5,080	$	—	$	—	$	5,080
Other government-related debt securities:
Obligations of U.S. government agencies and FDIC-guaranteed bank debt		—		2,208		—		2,208
Foreign and other		—		852		—		852
Corporate debt securities:
Financial		—		2,296		—		2,296
Industrial		—		2,507		—		2,507
Other		—		316		—		316
Mortgage- and asset-backed securities		—		841		—		841
Money market mutual funds		3,030		—		—		3,030
Other short-term interest-bearing securities		—		147		—		147
Equity securities		48		—		—		48
Derivatives:
Foreign currency contracts		—		154		—		154
Interest rate swap contracts		—		195		—		195
Total assets	$	8,158	$	9,516	$	—	$	17,674
Liabilities:
Derivatives:
Foreign currency contracts	$	—	$	103	$	—	$	103
Total liabilities	$	—	$	103	$	—	$	103