Business Combinations, Intangibles and Goodwill - Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 5,179	$ 5,163
Accumulated Amortization	(3,138)	(3,038)
Net Book Value	2,041	2,125
Purchased technology
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	2,949	2,935
Accumulated Amortization	(1,728)	(1,668)
Net Book Value	1,221	1,267
Patents
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	225	225
Accumulated Amortization	(120)	(117)
Net Book Value	105	108
Software licenses
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	108	108
Accumulated Amortization	(93)	(93)
Net Book Value	15	15
Trademarks and tradenames
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	226	226
Accumulated Amortization	(141)	(136)
Net Book Value	85	90
Customer relationships and customer lists
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	1,473	1,473
Accumulated Amortization	(1,003)	(974)
Net Book Value	470	499
Leasehold interest
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	152	152
Accumulated Amortization	(17)	(16)
Net Book Value	135	136
Other
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	46	44
Accumulated Amortization	(36)	(34)
Net Book Value	$ 10	$ 10