Quarterly report pursuant to Section 13 or 15(d)

Cash and Investments, Available-for-Sale Investments (Detail)

v3.3.0.814
Cash and Investments, Available-for-Sale Investments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Dec. 27, 2014
Available-for-sale Securities [Abstract]          
Adjusted Cost $ 14,602   $ 14,602    
Fair Value 14,604   14,604    
Adjusted Cost, Total 17,889   17,889   $ 9,253
Gross Unrealized Gains, Total 2,355   2,355   3,794
Gross Unrealized Losses, Total (22)   (22)   (9)
Fair Value, Total 20,222   20,222   13,038
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 1,100 $ 373 1,200 $ 1,200  
Available-for-sale Securities, Gross Realized Gains 12 0 97 136  
Due in 1 year or less, Cost 12,643   12,643    
Due in 1-2 years, Cost 1,166   1,166    
Due in 2-5 years, Cost 661   661    
Instruments not due at a single maturity date, Cost 132   132    
Due in 1 year or less, Fair Value 12,651   12,651    
Due in 1-2 years, Fair Value 1,164   1,164    
Due in 2-5 years, Fair Value 660   660    
Instruments not due at a single maturity date, Fair Value 129   129    
Cash and Cash Equivalents [Member]          
Available-for-sale Securities [Abstract]          
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds 134 $ 82 134 $ 459  
Asset-Backed Securities [Member]          
Available-for-sale Securities [Abstract]          
Adjusted Cost 7   7   8
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (2)   (2)   (2)
Fair Value 5   5   6
Corporate Debt Securities [Member]          
Available-for-sale Securities [Abstract]          
Adjusted Cost 7,139   7,139   2,040
Gross Unrealized Gains 11   11   13
Gross Unrealized Losses (7)   (7)   (5)
Fair Value 7,143   7,143   2,048
Financial Institution Instruments [Member]          
Available-for-sale Securities [Abstract]          
Adjusted Cost 4,709   4,709   3,146
Gross Unrealized Gains 2   2   2
Gross Unrealized Losses (1)   (1)   (1)
Fair Value 4,710   4,710   3,147
Government Debt [Member]          
Available-for-sale Securities [Abstract]          
Adjusted Cost 2,747   2,747   741
Gross Unrealized Gains 0   0   0
Gross Unrealized Losses (1)   (1)   (1)
Fair Value 2,746   2,746   740
Marketable Equity Securities [Member]          
Available-for-sale Securities [Abstract]          
Adjusted Cost 3,287   3,287   3,318
Gross Unrealized Gains 2,342   2,342   3,779
Gross Unrealized Losses (11)   (11)   0
Fair Value $ 5,618   $ 5,618   $ 7,097