Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	15,573us-gaap_Goodwill	$ 15,599us-gaap_Goodwill
Patents and developed technology
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life	4 years 1 month 6 days
Trade names and other
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful life	3 years
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Acquisition purchase price	64
Intangible assets	26
Goodwill	17
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	21
Goodwill expected to be tax deductible	6

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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