Retirement Plan Benefits - Additional Information (Details) (USD $)	12 Months Ended					72 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Maximum	Dec. 31, 2013 EMC	Dec. 31, 2013 EMC Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution percentage				6.00%
Employer matching contribution, amount per quarter				$ 750
Defined Contribution Plan, Employer Discretionary Contribution Amount	68,000,000	88,000,000	73,000,000
Deferred compensation program limit for employee's investment allocation in the company stock fund						30.00%
Fair value of company stock fund held by Pension Plan	449,000,000	431,000,000	397,000,000		0
Under-funded status of Pension Plan	46,000,000	109,000,000
Accumulated actuarial loss and prior services cost reclassified from accumulated comprehensive loss to a component of net periodic benefit cost	15,000,000
Pension Plans net losses, primarily the result of a decrease in the discount rate at the end of 2011	53,000,000
Total balance included in accumulated other comprehensive loss that will be recognized as a component of net periodic benefit cost in 2013	$ 10,000,000
Concentration risk, percentage of Pension Plan net assets	5.00%	5.00%