Shareholders' Equity - Reconciliation from Basic To Diluted Earnings Per Share for both Numerators and Denominators (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income attributable to EMC Corporation	$ 487	$ 589	$ 739	$ 980
Incremental dilution from VMware	(1)	(1)	(2)	(3)
Net income – dilution attributable to EMC Corporation	$ 486	$ 588	$ 737	$ 977
Denominator:
Weighted average shares, basic	1,927	2,037	1,950	2,033
Weighted common stock equivalents	20	27	21	27
Assumed conversion of the 2013 Notes and associated warrants	0	0	0	10
Weighted average shares, diluted	1,947	2,064	1,971	2,070