GENERAL (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jul. 26, 2011 MediaMind Technologies, Inc. ("MediaMind")
GENERAL
Number of nationwide digital networks operated by the entity	3
Minimum number of advertisers, advertising agencies and content owners linked to the entity's digital networks	5,000
Minimum number of television, radio, cable, print and web publishing destinations linked to the entity's digital networks	29,000
Subsequent Event [Line Items]
Purchase consideration paid in cash		$ 498

Amount of cash paid to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph f(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant