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Business Combinations, Intangibles and Goodwill - Additional Information (Details) (All 2013 Acquisitions [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Entity
Business Acquisition [Line Items]  
Number of Businesses Acquired 6
Business Combination, Consideration Transferred $ 616
Consideration of acquisitions allocated to goodwill 490
Consideration of acquisitions allocated to intangibles 137
Consideration of acquisitions allocated to net liabilities $ 11
EMC
 
Business Acquisition [Line Items]  
Number of Businesses Acquired 5