Related Parties (Schedule of Related Party Transactions) (Details) - EMC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Reseller revenues
Related Party Transaction [Line Items]
Revenue from related party	$ 69	$ 43	$ 131	$ 89
Unearned revenues	261		261		$ 290
Internal-use revenues
Related Party Transaction [Line Items]
Revenue from related party	6	5	9	13
Unearned revenues	14		14		18
Professional services revenues
Related Party Transaction [Line Items]
Revenue from related party	24	18	48	40
Unearned revenues	3		3		9
Agency fee revenues
Related Party Transaction [Line Items]
Revenue from related party	3	1	4	2
Unearned revenues	0		0		$ 0
Reimbursement for transition services
Related Party Transaction [Line Items]
Revenue from related party	1	0	2	2
Purchases and leases of products and purchases of services
Related Party Transaction [Line Items]
Related party costs	12	12	31	33
Collaborative technology project costs
Related Party Transaction [Line Items]
Related party costs	1	3	3	7
EMC subsidiary support and administrative costs
Related Party Transaction [Line Items]
Related party costs	26	35	54	76
Purchases of Products and Services Through Channel [Member]
Related Party Transaction [Line Items]
Related party costs	$ 18	$ 8	$ 26	$ 11