Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended												3 Months Ended		3 Months Ended				12 Months Ended
	Mar. 31, 2014 Security	Dec. 31, 2013	Mar. 31, 2014 Minimum	Mar. 31, 2014 Maximum	Mar. 31, 2014 US Government Agencies Debt Securities	Dec. 31, 2013 US Government Agencies Debt Securities	Mar. 31, 2014 US Corporate Debt Securities	Dec. 31, 2013 US Corporate Debt Securities	Mar. 31, 2014 High Yield Corporate Debt Securities	Dec. 31, 2013 High Yield Corporate Debt Securities	Mar. 31, 2014 Municipal Obligations	Dec. 31, 2013 Municipal Obligations	Mar. 31, 2014 Debt Securities	Dec. 31, 2013 Debt Securities	Mar. 31, 2014 Foreign Debt Securities	Dec. 31, 2013 Foreign Debt Securities	Mar. 31, 2014 Foreign Sovereign Debt Securities	Mar. 31, 2014 Auction Rate Securities	Dec. 31, 2013 Auction Rate Securities	Mar. 31, 2014 Variable Rate Demand Note	Dec. 31, 2012 LenovoEMC	Mar. 31, 2014 LenovoEMC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Joint Venture, Ownership Interest Percentage																						49.00%
Short-term investments	$ 1,964,000,000	$ 2,773,000,000																		$ 64,000,000
Number of Auction Rate Securities With Underlying Loans Which Have No Guarantees	1
Available-for-sale Securities					2,745,000,000	3,727,000,000	2,356,000,000	2,266,000,000	565,000,000	531,000,000	828,000,000	863,000,000	8,851,000,000	9,602,000,000	2,298,000,000	2,155,000,000		59,000,000	60,000,000
Average credit rating															A+		AAA	AA
Investment Holding Period	5 years
Percentage of Available For Sale Securities Debt Securities																	4.00%
Auction rate securities that have partial guarantees by the U.S. government, market value	$ 0
Coupon rate used to estimate fair value of invesments - Start Range			10.00%
Coupon rate used to estimate fair value of invesments - End Range				0.00%
Discount rate used to estimate fair value of investments	1.00%																				6.00%
The rate used for the discount margin to determine the estimated fair value of investment in auction rate securities	1.00%	1.00%
Percentage of Loans Guaranteed	95.00%