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Business Combinations, Intangibles and Goodwill - Additional Information (Details) (All 2013 Acquisitions [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Entity
Business Acquisition [Line Items]  
Number of Businesses Acquired 3
Business Combination, Consideration Transferred $ 207
Consideration of acquisitions allocated to goodwill 172
Consideration of acquisitions allocated to intangibles 43
Consideration of acquisitions allocated to net liabilities $ 8
EMC
 
Business Acquisition [Line Items]  
Number of Businesses Acquired 2