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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Short-term investments $ 2,407   $ 2,407   $ 2,726
Impairment of joint venture     39 $ 0  
Foreign debt securities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Available-for-sale Securities $ 2,247   $ 2,247   2,323
Average credit rating     A+    
Foreign Sovereign Debt Securities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Average credit rating     AA+    
Percentage of securities 4.00%   4.00%    
Auction rate securities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Available-for-sale Securities         $ 25
Change in fair value of level 3 investment no material changes no material changes   no material changes  
The rate used for the discount margin to determine the estimated fair value of investment in auction rate securities 0.00%   0.00%    
Variable Rate Demand Note          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Short-term investments $ 28   $ 28    
LenovoEMC [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Change in fair value of level 3 investment no material changes no material changes   no material changes  
Ownership percentage, joint venture 49.00%   49.00%