Business Combinations, Intangibles and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 5,576	$ 5,163
Accumulated Amortization	(3,337)	(3,038)
Net Book Value	2,239	2,125
Purchased technology
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	3,266	2,935
Accumulated Amortization	(1,845)	(1,668)
Net Book Value	1,421	1,267
Patents
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	225	225
Accumulated Amortization	(128)	(117)
Net Book Value	97	108
Software licenses
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	111	108
Accumulated Amortization	(94)	(93)
Net Book Value	17	15
Trademarks and tradenames
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	253	226
Accumulated Amortization	(151)	(136)
Net Book Value	102	90
Customer relationships and customer lists
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	1,523	1,473
Accumulated Amortization	(1,060)	(974)
Net Book Value	463	499
Leasehold interest
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	152	152
Accumulated Amortization	(19)	(16)
Net Book Value	133	136
Other
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	46	44
Accumulated Amortization	(40)	(34)
Net Book Value	$ 6	$ 10