Goodwill and acquisition-related intangibles (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, net	$ 4,362,000,000			$ 4,362,000,000			$ 4,362,000,000
Goodwill, accumulated impairment	90,000,000			90,000,000			90,000,000
Goodwill, impairment loss				0		0
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Gross Carrying Amount	2,948,000,000			2,948,000,000			2,991,000,000
Acquisition-related Intangibles: Accumulated Amortization	966,000,000			966,000,000			768,000,000
Acquisition-related Intangibles: Net	1,982,000,000			1,982,000,000			2,223,000,000
Amortization of acquisition-related intangibles	80,000,000		83,000,000	241,000,000		253,000,000
Developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Gross Carrying Amount	2,128,000,000			2,128,000,000			2,157,000,000
Acquisition-related Intangibles: Accumulated Amortization	659,000,000			659,000,000			526,000,000
Acquisition-related Intangibles: Net	1,469,000,000			1,469,000,000			1,631,000,000
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Amortization Period				8 years
Acquisition-related Intangibles: Gross Carrying Amount	810,000,000			810,000,000			821,000,000
Acquisition-related Intangibles: Accumulated Amortization	305,000,000			305,000,000			239,000,000
Acquisition-related Intangibles: Net	505,000,000			505,000,000			582,000,000
Other intangibles
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Amortization Period				5 years
Acquisition-related Intangibles: Gross Carrying Amount	3,000,000			3,000,000			5,000,000
Acquisition-related Intangibles: Accumulated Amortization	2,000,000			2,000,000			3,000,000
Acquisition-related Intangibles: Net	1,000,000			1,000,000			2,000,000
In-process R&D
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Gross Carrying Amount	7,000,000	[1]		7,000,000	[1]		8,000,000	[1]
Acquisition-related Intangibles: Net	$ 7,000,000	[1]		$ 7,000,000	[1]		$ 8,000,000	[1]
Minimum | Developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Amortization Period				5 years
Maximum | Developed technology
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related Intangibles: Amortization Period				10 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 is expensed.