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Shareholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		25 Months Ended	1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Nov. 30, 2006	Mar. 17, 2014	Feb. 27, 2015	Dec. 09, 2014	Dec. 01, 2014	Jul. 30, 2014	Apr. 17, 2014	Feb. 06, 2014	May 30, 2013	Feb. 28, 2013	Jan. 27, 2015	Aug. 01, 2014
Sold warrants to acquire shares of our common stock, exercise price per share				19.55
Common stock excluded from calculation of diluted earnings per share	1,000,000	6,000,000
Repurchases of Common Stock, shares authorized to repurchase	500,000,000		500,000,000					250,000,000					250,000,000
Total Repurchases of Common Stock, cost	$ 1,400,000,000		$ 6,800,000,000
Total Repurchases of Common Stock, shares	54,000,000		255,000,000
Shares authorized for future repurchases	245,000,000		245,000,000
Payments for Repurchase of Common Stock	1,346,000,000	390,000,000
Approved dividend (in usd per share)						$ 0.115us-gaap_DividendsPayableAmountPerShare	$ 0.115us-gaap_DividendsPayableAmountPerShare		$ 0.115us-gaap_DividendsPayableAmountPerShare	$ 0.115us-gaap_DividendsPayableAmountPerShare	$ 0.10us-gaap_DividendsPayableAmountPerShare	$ 0.10us-gaap_DividendsPayableAmountPerShare
Sold Warrants
Sold warrants to acquire shares of our common stock				215,000,000
Warrant
Warrants exercised					109,000,000
Exercised Warrants
Conversion of Stock, Shares Issued					29,000,000
VMware
Total Repurchases of Common Stock, shares	5,000,000
Payments for Repurchase of Common Stock	438,000,000	169,000,000
Stock Repurchase Program, Authorized Amount	2,000,000,000		2,000,000,000											1,000,000,000	1,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,500,000,000		$ 1,500,000,000