Goodwill and acquisition-related intangibles (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Goodwill [Line Items]
Goodwill, net	$ 4,362			$ 4,362
Goodwill, Accumulated Impairment	90			90
Goodwill, Impairment Loss	0
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	3,042			3,043
Acquisition-related intangibles: Accumulated Amortization	569			485
Acquisition-related intangibles: Net	2,473			2,558
Amortization of acquisition-related intangibles	85		86
Developed Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	2,153			2,145
Acquisition-related intangibles: Accumulated Amortization	367			312
Acquisition-related intangibles: Net	1,786			1,833
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	821			821
Acquisition-related intangibles: Accumulated Amortization	162			137
Acquisition-related intangibles: Net	659			684
Other Intangibles [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	46			46
Acquisition-related intangibles: Accumulated Amortization	40			36
Acquisition-related intangibles: Net	6			10
In-process R&D [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	22	[1]		31	[1]
Acquisition-related intangibles: Net	$ 22	[1]		$ 31	[1]
Minimum [Member] | Developed Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period	5 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period	5 years
Minimum [Member] | Other Intangibles [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period	2 years
Maximum [Member] | Developed Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period	10 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period	8 years
Maximum [Member] | Other Intangibles [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period	7 years

[1] In-process R&D is not amortized until the associated project has been completed. Alternatively, if the associated project is determined not to be viable, it will be expensed.