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Summary of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 27, 2014
Sep. 28, 2013
Debt Instrument [Line Items]    
Total borrowings $ 29,000 $ 17,000
Unamortized discount (52) (40)
Hedge accounting fair value adjustments 39 0
Total long-term debt 28,987 16,960
Floating-rate notes due 2016
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 1,000 1,000
Debt instrument effective interest rate 0.51% 0.51%
Floating-rate notes due 2017
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 1,000 0
Debt instrument effective interest rate 0.31% 0.00%
Floating-rate notes due 2018
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 2,000 2,000
Debt instrument effective interest rate 1.10% 1.10%
Floating-rate notes due 2019
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 1,000 0
Debt instrument effective interest rate 0.54% 0.00%
Fixed-rate 0.45% notes due 2016
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 1,500 1,500
Debt instrument effective interest rate 0.51% 0.51%
Fixed-rate 1.05% notes due 2017
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 1,500 0
Debt instrument effective interest rate 0.30% 0.00%
Fixed-rate 1.00% notes due 2018
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 4,000 4,000
Debt instrument effective interest rate 1.08% 1.08%
Fixed-rate 2.10% notes due 2019
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 2,000 0
Debt instrument effective interest rate 0.53% 0.00%
Fixed-rate 2.85% notes due 2021
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 3,000 0
Debt instrument effective interest rate 0.79% 0.00%
Fixed-rate 2.40% notes due 2023
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 5,500 5,500
Debt instrument effective interest rate 2.44% 2.44%
Fixed-rate 3.45% notes due 2024
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 2,500 0
Debt instrument effective interest rate 0.90% 0.00%
Fixed-rate 3.85% notes due 2043
   
Debt Instrument [Line Items]    
Debt instrument, senior notes 3,000 3,000
Debt instrument effective interest rate 3.91% 3.91%
Fixed-rate 4.45% notes due 2044
   
Debt Instrument [Line Items]    
Debt instrument, senior notes $ 1,000 $ 0
Debt instrument effective interest rate 4.48% 0.00%