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Adjustments Related to Fair Value Hedges Included in Net Interest Expense in Consolidated Statements of Income (Details) - Interest rate - Interest Expense - USD ($)
$ in Millions
3 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on pay-floating swaps $ (113) $ 117
Gain (loss) on hedged borrowings 113 (117)
Derivative, Gain (Loss) on Derivative, Net $ (12) $ (14)