Business Combinations, Intangibles and Goodwill - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Cash paid	$ 59	$ 61
Aggregate allocation to goodwill	17,137		$ 17,090
VMware | Arkin Net, Inc. [Member]
Business Acquisition [Line Items]
Aggregate consideration	67
Aggregate allocation to goodwill	38
Aggregate allocation to intangibles	26
Aggregate allocation to net assets	$ 3
Minimum | VMware | Arkin Net, Inc. [Member]
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets acquired	4 years
Maximum | VMware | Arkin Net, Inc. [Member]
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets acquired	5 years