Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Country	Dec. 31, 2014 USD ($) Country
UNITED STATES
Segment Reporting Information [Line Items]
Long-lived assets, excluding financial instruments, deferred tax assets, goodwill and intangible assets | $	$ 4,584	$ 4,355
International
Segment Reporting Information [Line Items]
Long-lived assets, excluding financial instruments, deferred tax assets, goodwill and intangible assets | $	$ 1,053	$ 1,021
Sales Revenue, Segment | Geographic risk
Segment Reporting Information [Line Items]
Number of countries, other than United States, that accounted for 10% or more of total revenue | Country	0	0
Long-lived Assets, Total | Geographic risk
Segment Reporting Information [Line Items]
Number of countries, other than United States, that accounted for 10% or more of total revenue | Country	0	0
EMC Information Infrastructure
Segment Reporting Information [Line Items]
Number of operating segments	3