Business Combinations, Intangibles and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 5,614	$ 5,584
Accumulated Amortization	(3,616)	(3,435)
Net Book Value	1,998	2,149
Purchased technology
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	3,298	3,272
Accumulated Amortization	(2,017)	(1,903)
Net Book Value	1,281	1,369
Patents
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	225	225
Accumulated Amortization	(139)	(132)
Net Book Value	86	93
Software licenses
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	115	112
Accumulated Amortization	(94)	(94)
Net Book Value	21	18
Trademarks and tradenames
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	254	254
Accumulated Amortization	(168)	(157)
Net Book Value	86	97
Customer relationships and customer lists
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	1,524	1,523
Accumulated Amortization	(1,131)	(1,087)
Net Book Value	393	436
Leasehold interest
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	152	152
Accumulated Amortization	(23)	(20)
Net Book Value	129	132
Other
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	46	46
Accumulated Amortization	(44)	(42)
Net Book Value	$ 2	$ 4