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Financial Instruments - Cash and Available-for-Sale Securities' Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents or Short-Term or Long-Term Marketable Securities (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Sep. 24, 2016
Dec. 26, 2015
Sep. 26, 2015
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 247,073 $ 235,810    
Unrealized Gains 622 2,186    
Unrealized Losses (1,605) (411)    
Fair Value 246,090 237,585    
Cash and cash equivalents 16,371 20,484 $ 16,689 $ 21,120
Short-term marketable securities 44,081 46,671    
Long-term marketable securities 185,638 170,430    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 9,359 8,601    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 9,359 8,601    
Cash and cash equivalents 9,359 8,601    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,644 5,073    
Unrealized Gains 0 0    
Unrealized Losses (137) (146)    
Fair Value 5,507 4,927    
Cash and cash equivalents 4,640 3,666    
Short-term marketable securities 867 1,261    
Long-term marketable securities 0 0    
Level 1 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 4,640 3,666    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 4,640 3,666    
Cash and cash equivalents 4,640 3,666    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1 | Mutual funds        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,004 1,407    
Unrealized Gains 0 0    
Unrealized Losses (137) (146)    
Fair Value 867 1,261    
Cash and cash equivalents 0 0    
Short-term marketable securities 867 1,261    
Long-term marketable securities 0 0    
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 232,070 222,136    
Unrealized Gains 622 2,186    
Unrealized Losses (1,468) (265)    
Fair Value 231,224 224,057    
Cash and cash equivalents 2,372 8,217    
Short-term marketable securities 43,214 45,410    
Long-term marketable securities 185,638 170,430    
Level 2 | U.S. Treasury securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 48,431 41,697    
Unrealized Gains 47 319    
Unrealized Losses (333) (4)    
Fair Value 48,145 42,012    
Cash and cash equivalents 1,022 1,527    
Short-term marketable securities 13,074 13,492    
Long-term marketable securities 34,049 26,993    
Level 2 | U.S. agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 4,284 7,543    
Unrealized Gains 4 16    
Unrealized Losses (10) 0    
Fair Value 4,278 7,559    
Cash and cash equivalents 404 2,762    
Short-term marketable securities 1,999 2,441    
Long-term marketable securities 1,875 2,356    
Level 2 | Non-U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 7,574 7,609    
Unrealized Gains 79 259    
Unrealized Losses (136) (27)    
Fair Value 7,517 7,841    
Cash and cash equivalents 0 110    
Short-term marketable securities 408 818    
Long-term marketable securities 7,109 6,913    
Level 2 | Certificates of deposit and time deposits        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,893 6,598    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 5,893 6,598    
Cash and cash equivalents 334 1,108    
Short-term marketable securities 4,089 3,897    
Long-term marketable securities 1,470 1,593    
Level 2 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,750 7,433    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 3,750 7,433    
Cash and cash equivalents 536 2,468    
Short-term marketable securities 3,214 4,965    
Long-term marketable securities 0 0    
Level 2 | Corporate securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 140,697 131,166    
Unrealized Gains 469 1,409    
Unrealized Losses (737) (206)    
Fair Value 140,429 132,369    
Cash and cash equivalents 76 242    
Short-term marketable securities 20,283 19,599    
Long-term marketable securities 120,070 112,528    
Level 2 | Municipal securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 955 956    
Unrealized Gains 0 5    
Unrealized Losses (9) 0    
Fair Value 946 961    
Cash and cash equivalents 0 0    
Short-term marketable securities 111 167    
Long-term marketable securities 835 794    
Level 2 | Mortgage- and asset-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 20,486 19,134    
Unrealized Gains 23 178    
Unrealized Losses (243) (28)    
Fair Value 20,266 19,284    
Cash and cash equivalents 0 0    
Short-term marketable securities 36 31    
Long-term marketable securities $ 20,230 $ 19,253