Reconciliation from Basic To Diluted Earnings Per Share for both Numerators and Denominators (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net income attributable to EMC Corporation	$ 392	$ 580
Incremental dilution from VMware	(2)	(1)
Net income - dilution attributable to EMC Corporation	$ 390	$ 579
Denominator:
Weighted average shares, basic	2,029	2,102
Weighted common stock equivalents	26	30
Assumed conversion of the 2013 Notes and associated warrants	21	57
Weighted average shares, diluted	2,076	2,189