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Debt - Summary of Term Debt (Details) - USD ($)
 3 Months Ended
Dec. 30, 2017
Sep. 30, 2017
Debt Instrument [Line Items]    
Total term debt $ 111,033,000,000 $ 104,021,000,000
Unamortized premium/(discount) and issuance costs, net (246,000,000) (225,000,000)
Hedge accounting fair value adjustments (367,000,000) (93,000,000)
Less: Current portion of long-term debt (6,498,000,000) (6,496,000,000)
Total long-term debt 103,922,000,000 97,207,000,000
2013 debt issuance of $17.0 billion    
Debt Instrument [Line Items]    
Debt instrument, face amount 17,000,000,000  
2013 debt issuance of $17.0 billion | Floating-rate notes    
Debt Instrument [Line Items]    
Total term debt $ 2,000,000,000 $ 2,000,000,000
Debt instrument, maturity year, start 2018  
Debt instrument, maturity year, end 2018  
2013 debt issuance of $17.0 billion | Floating-rate notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.10% 1.10%
2013 debt issuance of $17.0 billion | Floating-rate notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.10% 1.10%
2013 debt issuance of $17.0 billion | Fixed-rate 1.000% – 3.850% notes    
Debt Instrument [Line Items]    
Total term debt $ 12,500,000,000 $ 12,500,000,000
Debt instrument, maturity year, start 2018  
Debt instrument, maturity year, end 2043  
2013 debt issuance of $17.0 billion | Fixed-rate 1.000% – 3.850% notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 1.00%  
Debt instrument, effective interest rate 1.08% 1.08%
2013 debt issuance of $17.0 billion | Fixed-rate 1.000% – 3.850% notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 3.85%  
Debt instrument, effective interest rate 3.91% 3.91%
2014 debt issuance of $12.0 billion    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 12,000,000,000  
2014 debt issuance of $12.0 billion | Floating-rate notes    
Debt Instrument [Line Items]    
Total term debt $ 1,000,000,000 $ 1,000,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2019  
2014 debt issuance of $12.0 billion | Floating-rate notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.69% 1.61%
2014 debt issuance of $12.0 billion | Floating-rate notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.69% 1.61%
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes    
Debt Instrument [Line Items]    
Total term debt $ 8,500,000,000 $ 8,500,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2044  
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 2.10%  
Debt instrument, effective interest rate 1.69% 1.61%
2014 debt issuance of $12.0 billion | Fixed-rate 2.100% – 4.450% notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 4.45%  
Debt instrument, effective interest rate 4.48% 4.48%
2015 debt issuances of $27.3 billion    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 27,300,000,000  
2015 debt issuances of $27.3 billion | Floating-rate notes    
Debt Instrument [Line Items]    
Total term debt $ 1,544,000,000 $ 1,549,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2020  
2015 debt issuances of $27.3 billion | Floating-rate notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.65% 1.56%
2015 debt issuances of $27.3 billion | Floating-rate notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.87% 1.87%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes    
Debt Instrument [Line Items]    
Total term debt $ 24,555,000,000 $ 24,522,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2045  
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 0.35%  
Debt instrument, effective interest rate 0.28% 0.28%
2015 debt issuances of $27.3 billion | Fixed-rate 0.350% – 4.375% notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 4.375%  
Debt instrument, effective interest rate 4.51% 4.51%
2016 debt issuances of $24.9 billion    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 24,900,000,000  
2016 debt issuances of $24.9 billion | Floating-rate notes    
Debt Instrument [Line Items]    
Total term debt $ 1,350,000,000 $ 1,350,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2021  
2016 debt issuances of $24.9 billion | Floating-rate notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.53% 1.45%
2016 debt issuances of $24.9 billion | Floating-rate notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 2.59% 2.44%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes    
Debt Instrument [Line Items]    
Total term debt $ 23,635,000,000 $ 23,645,000,000
Debt instrument, maturity year, start 2018  
Debt instrument, maturity year, end 2046  
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 1.10%  
Debt instrument, effective interest rate 1.13% 1.13%
2016 debt issuances of $24.9 billion | Fixed-rate 1.100% – 4.650% notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 4.65%  
Debt instrument, effective interest rate 4.78% 4.78%
2017 debt issuances of $28.7 billion    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 28,700,000,000  
2017 debt issuances of $28.7 billion | Floating-rate notes    
Debt Instrument [Line Items]    
Total term debt $ 3,250,000,000 $ 3,250,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2022  
2017 debt issuances of $28.7 billion | Floating-rate notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.48% 1.38%
2017 debt issuances of $28.7 billion | Floating-rate notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, effective interest rate 1.90% 1.81%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes    
Debt Instrument [Line Items]    
Total term debt $ 25,699,000,000 $ 25,705,000,000
Debt instrument, maturity year, start 2019  
Debt instrument, maturity year, end 2047  
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 0.875%  
Debt instrument, effective interest rate 1.54% 1.51%
2017 debt issuances of $28.7 billion | Fixed-rate 0.875% – 4.300% notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 4.30%  
Debt instrument, effective interest rate 4.30% 4.30%
First quarter 2018 debt issuance of $7.0 billion    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 7,000,000,000  
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 1.800% notes    
Debt Instrument [Line Items]    
Total term debt $ 1,000,000,000 $ 0
Debt instrument, maturity year 2019  
Debt instrument, stated interest rate 1.80%  
Debt instrument, effective interest rate 1.83% 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.000% notes    
Debt Instrument [Line Items]    
Total term debt $ 1,000,000,000 $ 0
Debt instrument, maturity year 2020  
Debt instrument, stated interest rate 2.00%  
Debt instrument, effective interest rate 2.03% 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.400% notes    
Debt Instrument [Line Items]    
Total term debt $ 750,000,000 $ 0
Debt instrument, maturity year 2023  
Debt instrument, stated interest rate 2.40%  
Debt instrument, effective interest rate 1.93% 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 2.750% notes    
Debt Instrument [Line Items]    
Total term debt $ 1,500,000,000 $ 0
Debt instrument, maturity year 2025  
Debt instrument, stated interest rate 2.75%  
Debt instrument, effective interest rate 2.77% 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 3.000% notes    
Debt Instrument [Line Items]    
Total term debt $ 1,500,000,000 $ 0
Debt instrument, maturity year 2027  
Debt instrument, stated interest rate 3.00%  
Debt instrument, effective interest rate 2.13% 0.00%
First quarter 2018 debt issuance of $7.0 billion | Fixed-rate 3.750% notes    
Debt Instrument [Line Items]    
Total term debt $ 1,250,000,000 $ 0
Debt instrument, maturity year 2047  
Debt instrument, stated interest rate 3.75%  
Debt instrument, effective interest rate 3.80% 0.00%