Business Combinations, Intangibles and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 5,193	$ 5,163
Accumulated Amortization	(3,240)	(3,038)
Net Book Value	1,953	2,125
Purchased technology
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	2,961	2,935
Accumulated Amortization	(1,788)	(1,668)
Net Book Value	1,173	1,267
Patents
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	225	225
Accumulated Amortization	(124)	(117)
Net Book Value	101	108
Software licenses
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	110	108
Accumulated Amortization	(94)	(93)
Net Book Value	16	15
Trademarks and tradenames
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	226	226
Accumulated Amortization	(146)	(136)
Net Book Value	80	90
Customer relationships and customer lists
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	1,473	1,473
Accumulated Amortization	(1,032)	(974)
Net Book Value	441	499
Leasehold interest
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	152	152
Accumulated Amortization	(18)	(16)
Net Book Value	134	136
Other
Schedule of Intangible Assets, Excluding Goodwill [Line Items]
Gross Carrying Amount	46	44
Accumulated Amortization	(38)	(34)
Net Book Value	$ 8	$ 10