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Financial Instruments - Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Cash Flow and Net Investment Hedges (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges $ 489  
Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges 271  
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges 491  
Foreign currency debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) recognized in OCI – included in effectiveness assessment, net investment hedges 24  
Gains/(Losses) recognized in OCI – included in effectiveness assessment, net investment hedges   $ (16)
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges $ (2)  
Cash flow hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges   (119)
Cash flow hedges | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) recognized in OCI – included in effectiveness assessment, cash flow hedges   (478)
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges   (118)
Cash flow hedges | Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains/(Losses) reclassified from AOCI into net income – included in effectiveness assessment, cash flow hedges   $ (1)