Goodwill and acquisition-related intangibles (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012		Jun. 30, 2012		Dec. 31, 2011
Goodwill [Line Items]
Goodwill	$ 4,452		$ 4,452		$ 4,452
Goodwill, Impairment Loss	0		0
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	3,054		3,054		3,054
Acquisition-related intangibles: Accumulated Amortization	325		325		154
Acquisition-related intangibles: Net	2,729		2,729		2,900
Amortization of acquisition-related intangibles	86		171
National [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization of acquisition-related intangibles	81		162
Developed Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period, minimum			4
Acquisition-related intangibles: Amortization Period, maximum			10
Acquisition-related intangibles: Gross Carrying Amount	2,140		2,140		2,089
Acquisition-related intangibles: Accumulated Amortization	205		205		91
Acquisition-related intangibles: Net	1,935		1,935		1,998
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period, minimum			5
Acquisition-related intangibles: Amortization Period, maximum			8
Acquisition-related intangibles: Gross Carrying Amount	822		822		822
Acquisition-related intangibles: Accumulated Amortization	86		86		34
Acquisition-related intangibles: Net	736		736		788
Other Intangibles [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Amortization Period, minimum			2
Acquisition-related intangibles: Amortization Period, maximum			7
Acquisition-related intangibles: Gross Carrying Amount	50		50		50
Acquisition-related intangibles: Accumulated Amortization	34		34		29
Acquisition-related intangibles: Net	16		16		21
In-process R&D [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Acquisition-related intangibles: Gross Carrying Amount	42	[1]	42	[1]	93	[1]
Acquisition-related intangibles: Accumulated Amortization	0	[1]	0	[1]	0	[1]
Acquisition-related intangibles: Net	$ 42	[1]	$ 42	[1]	$ 93	[1]

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