Goodwill and Intangible Assets (Acquired Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Acquired intangible assets disclosures
Total gross carrying amount	$ 2,920	$ 2,958
Total accumulated amortization	(1,639)	(1,646)
Total finite-lived intangible assets - net	1,281us-gaap_FiniteLivedIntangibleAssetsNet	1,312us-gaap_FiniteLivedIntangibleAssetsNet
Non-amortizable intangible assets (primarily tradenames)	115us-gaap_IndefiniteLivedTradeNames	123us-gaap_IndefiniteLivedTradeNames
Total intangible assets - net	1,396	1,435
Purchased finite-lived intangible assets	52
Customer related intangible assets
Acquired intangible assets disclosures
Total gross carrying amount	1,339	1,348
Total accumulated amortization	(599)	(597)
Patents
Acquired intangible assets disclosures
Total gross carrying amount	561	581
Total accumulated amortization	(457)	(472)
Other technology-based intangible assets
Acquired intangible assets disclosures
Total gross carrying amount	400	407
Total accumulated amortization	(218)	(215)
Definite-lived tradenames
Acquired intangible assets disclosures
Total gross carrying amount	396	401
Total accumulated amortization	(197)	(195)
Other amortizable intangible assets
Acquired intangible assets disclosures
Total gross carrying amount	224	221
Total accumulated amortization	$ (168)	$ (167)

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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