Business Combinations, Intangibles and Goodwill - Additional Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,694	$ 207
Increase in Restricted Cash	76	0
Gain on previously held interests in strategic investments	(45)	0
Goodwill	15,802		14,424
All 2014 Acquisitions
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	8
Business Combination, Contingent Compensation	11
Business Combination, Consideration Transferred	721
Payments to Acquire Businesses, Gross	657
Gain on previously held interests in strategic investments	(45)
Goodwill	509
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	(88)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
VMware | AirWatch
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	24
Business Combination, Contingent Compensation	300
Business Combination, Consideration Transferred	1,092
Payments to Acquire Businesses, Net of Cash Acquired	1,068
Business Combination, Retention Bonus	60
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	250
Other Intangible Assets
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Other Intangible Assets | VMware | AirWatch
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	14
Trademarks and Trade Names
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Trademarks and Trade Names | VMware | AirWatch
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	40
Customer Relationships And Customer Lists
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
Customer Relationships And Customer Lists | VMware | AirWatch
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	78
Developed Technology Rights
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years
Developed Technology Rights | VMware | AirWatch
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 118