Goodwill and other acquisition-related intangibles (Other acquisition-related intangibles) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended						0 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Developed Technology [Member] years	Dec. 31, 2010 Developed Technology [Member]	Sep. 30, 2011 Customer Relationships [Member] years	Dec. 31, 2010 Customer Relationships [Member]	Sep. 30, 2011 Other Intangible Assets [Member] years	Dec. 31, 2010 Other Intangible Assets [Member]	Sep. 30, 2011 National [Member] In-process Research and Development [Member]		Sep. 30, 2011 In-process Research and Development [Member]	Dec. 31, 2010 In-process Research and Development [Member]	Sep. 30, 2011 National [Member]	Sep. 23, 2011 National [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period, minimum			4		5		3
Acquisition-related intangibles: Amortization Period, maximum			10		8		10
Acquisition-related intangibles: Gross Carrying Amount	$ 3,188	$ 215	$ 2,180	$ 155	$ 835	$ 26	$ 68	$ 34			$ 105	$ 0
Acquisition-related intangibles: Accumulated Amortization	164	139	117	100	21	18	26	21			0	0
Acquisition-related intangibles: Net	3,024	76	2,063	55	814	8	42	13			105	0
Intangible assets associated with acquisitions	2,974								105	[1]			2,974	2,974
Amortization of acquisition-related intangibles	$ 25												$ 6

[1] In-process research and development is not amortized until the associated project has been completed. Alternatively, if the associated project is not viable, it will be expensed.