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Debt - Summary of Term Debt (Detail)
12 Months Ended
Sep. 24, 2016
USD ($)
Sep. 26, 2015
USD ($)
Sep. 24, 2016
AUD
Debt Instrument [Line Items]      
Total term debt $ 78,384,000,000 $ 55,701,000,000  
Unamortized premium/(discount) and issuance costs, net (174,000,000) (248,000,000)  
Hedge accounting fair value adjustments 717,000,000 376,000,000  
Less: Current portion of long-term debt (3,500,000,000) (2,500,000,000)  
Total long-term debt 75,427,000,000 53,329,000,000  
2013 debt issuance      
Debt Instrument [Line Items]      
Debt instrument, face amount 17,000,000,000    
2013 debt issuance | Floating-rate notes      
Debt Instrument [Line Items]      
Debt instrument, senior notes $ 2,000,000,000 $ 3,000,000,000  
Debt instrument maturity year, start 2018  
Debt instrument maturity year, end 2018  
Debt instrument effective interest rate, minimum 1.10% 0.51%  
Debt instrument effective interest rate, maximum 1.10% 1.10%  
2013 debt issuance | Fixed-rate 1.000% - 3.850% notes      
Debt Instrument [Line Items]      
Debt instrument, senior notes $ 12,500,000,000 $ 14,000,000,000  
Debt instrument maturity year, start 2018  
Debt instrument maturity year, end 2043  
Debt instrument effective interest rate, minimum 1.08% 0.51%  
Debt instrument effective interest rate, maximum 3.91% 3.91%  
Debt instrument interest rate, minimum 1.00%    
Debt instrument interest rate, maximum 3.85%    
2014 debt issuance      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 12,000,000,000    
2014 debt issuance | Floating-rate notes      
Debt Instrument [Line Items]      
Debt instrument, senior notes $ 2,000,000,000 $ 2,000,000,000  
Debt instrument maturity year, start 2017  
Debt instrument maturity year, end 2019  
Debt instrument effective interest rate, minimum 0.86% 0.37%  
Debt instrument effective interest rate, maximum 1.09% 0.60%  
2014 debt issuance | Fixed-rate 1.050% - 4.450% notes      
Debt Instrument [Line Items]      
Debt instrument, senior notes $ 10,000,000,000 $ 10,000,000,000  
Debt instrument maturity year, start 2017  
Debt instrument maturity year, end 2044  
Debt instrument effective interest rate, minimum 0.85% 0.37%  
Debt instrument effective interest rate, maximum 4.48% 4.48%  
Debt instrument interest rate, minimum 1.05%    
Debt instrument interest rate, maximum 4.45%    
2015 debt issuance      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 27,300,000,000    
2015 debt issuance | Floating-rate notes      
Debt Instrument [Line Items]      
Debt instrument, senior notes $ 1,781,000,000 $ 1,743,000,000  
Debt instrument maturity year, start 2017  
Debt instrument maturity year, end 2020  
Debt instrument effective interest rate, minimum 0.87% 0.36%  
Debt instrument effective interest rate, maximum 1.87% 1.87%  
2015 debt issuance | Fixed-rate 0.350% - 4.375% notes      
Debt Instrument [Line Items]      
Debt instrument, senior notes $ 25,144,000,000 $ 24,958,000,000  
Debt instrument maturity year, start 2017  
Debt instrument maturity year, end 2045  
Debt instrument effective interest rate, minimum 0.28% 0.28%  
Debt instrument effective interest rate, maximum 4.51% 4.51%  
Debt instrument interest rate, minimum 0.35%    
Debt instrument interest rate, maximum 4.375%    
Second quarter 2016 debt issuance      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 15,500,000,000    
Second quarter 2016 debt issuance | Floating Rate Notes Due 2019      
Debt Instrument [Line Items]      
Debt instrument maturity year 2019    
Debt instrument, senior notes $ 500,000,000    
Debt instrument effective interest rate 1.64%   1.64%
Second quarter 2016 debt issuance | Floating Rate Notes Due 2021      
Debt Instrument [Line Items]      
Debt instrument maturity year 2021    
Debt instrument, senior notes $ 500,000,000    
Debt instrument effective interest rate 1.95%   1.95%
Second quarter 2016 debt issuance | Fixed-rate 1.300% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2018    
Debt instrument, senior notes $ 500,000,000    
Debt instrument effective interest rate 1.32%   1.32%
Debt instrument interest rate 1.30%   1.30%
Second quarter 2016 debt issuance | Fixed-rate 1.700% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2019    
Debt instrument, senior notes $ 1,000,000,000    
Debt instrument effective interest rate 1.71%   1.71%
Debt instrument interest rate 1.70%   1.70%
Second quarter 2016 debt issuance | Fixed-rate 2.250% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2021    
Debt instrument, senior notes $ 3,000,000,000    
Debt instrument effective interest rate 1.91%   1.91%
Debt instrument interest rate 2.25%   2.25%
Second quarter 2016 debt issuance | Fixed-rate 2.850% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2023    
Debt instrument, senior notes $ 1,500,000,000    
Debt instrument effective interest rate 2.58%   2.58%
Debt instrument interest rate 2.85%   2.85%
Second quarter 2016 debt issuance | Fixed-rate 3.250% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2026    
Debt instrument, senior notes $ 3,250,000,000    
Debt instrument effective interest rate 2.51%   2.51%
Debt instrument interest rate 3.25%   3.25%
Second quarter 2016 debt issuance | Fixed-rate 4.500% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2036    
Debt instrument, senior notes $ 1,250,000,000    
Debt instrument effective interest rate 4.54%   4.54%
Debt instrument interest rate 4.50%   4.50%
Second quarter 2016 debt issuance | Fixed-rate 4.650% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2046    
Debt instrument, senior notes $ 4,000,000,000    
Debt instrument effective interest rate 4.58%   4.58%
Debt instrument interest rate 4.65%   4.65%
Third quarter 2016 Australian dollar denominated debt issuance      
Debt Instrument [Line Items]      
Debt instrument, face amount | AUD     AUD 1,400,000,000
Third quarter 2016 Australian dollar denominated debt issuance | Fixed-rate 2.650% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2020    
Debt instrument, senior notes $ 493,000,000    
Debt instrument effective interest rate 1.92%   1.92%
Debt instrument interest rate 2.65%   2.65%
Third quarter 2016 Australian dollar denominated debt issuance | Fixed-rate 3.350% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2024    
Debt instrument, senior notes $ 342,000,000    
Debt instrument effective interest rate 2.61%   2.61%
Debt instrument interest rate 3.35%   3.35%
Third quarter 2016 Australian dollar denominated debt issuance | Fixed-rate 3.600% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2026    
Debt instrument, senior notes $ 247,000,000    
Debt instrument effective interest rate 2.84%   2.84%
Debt instrument interest rate 3.60%   3.60%
Third quarter 2016 debt issuance | Fixed-rate 4.150% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2046    
Debt instrument, senior notes $ 1,377,000,000    
Debt instrument effective interest rate 4.15%   4.15%
Debt instrument, face amount $ 1,400,000,000    
Debt instrument interest rate 4.15%   4.15%
Fourth quarter 2016 debt issuance      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 7,000,000,000    
Fourth quarter 2016 debt issuance | Floating-rate notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2019    
Debt instrument, senior notes $ 350,000,000    
Debt instrument effective interest rate 0.91%   0.91%
Fourth quarter 2016 debt issuance | Fixed-rate 1.100% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2019    
Debt instrument, senior notes $ 1,150,000,000    
Debt instrument effective interest rate 1.13%   1.13%
Debt instrument interest rate 1.10%   1.10%
Fourth quarter 2016 debt issuance | Fixed-rate 1.550% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2021    
Debt instrument, senior notes $ 1,250,000,000    
Debt instrument effective interest rate 1.40%   1.40%
Debt instrument interest rate 1.55%   1.55%
Fourth quarter 2016 debt issuance | Fixed-rate 2.450% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2026    
Debt instrument, senior notes $ 2,250,000,000    
Debt instrument effective interest rate 2.15%   2.15%
Debt instrument interest rate 2.45%   2.45%
Fourth quarter 2016 debt issuance | Fixed-rate 3.850% notes      
Debt Instrument [Line Items]      
Debt instrument maturity year 2046    
Debt instrument, senior notes $ 2,000,000,000    
Debt instrument effective interest rate 3.86%   3.86%
Debt instrument interest rate 3.85%   3.85%