Shareholders' Equity - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended		16 Months Ended
	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Apr. 30, 2016	Dec. 01, 2014
Common stock excluded from calculation of diluted earnings per share	1	1	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
Payments for Repurchase of Common Stock		$ 0	$ 2,063
VMware
Payments for Repurchase of Common Stock		0	$ 850
Stock Repurchase Program, Authorized Amount					$ 1,200
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 835