Shareholders' Equity - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended		16 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Apr. 30, 2016	Dec. 01, 2014
Common stock excluded from calculation of diluted earnings per share	2	1
Repurchases of Common Stock, shares authorized to repurchase					250
Total Repurchases of Common Stock, cost			$ 715
Total Repurchases of Common Stock, shares			27
Shares authorized for future repurchases	223		223
Payments for Repurchase of Common Stock	$ 0	$ 1,346
VMware
Payments for Repurchase of Common Stock	0	$ 438
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 835		$ 835
Subsequent Event | VMware
Stock Repurchase Program, Authorized Amount				$ 1,200