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Debt - Summary of Cash Flows Associated with Commercial Paper (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Maturities 90 days or less:    
Proceeds from/(Repayments of) commercial paper, net $ (2,484) $ 4,070
Maturities greater than 90 days:    
Proceeds from commercial paper 10,235 5,550
Repayments of commercial paper (7,787) (9,619)
Proceeds from/(Repayments of) commercial paper, net 2,448 (4,069)
Total proceeds from/(repayments of) commercial paper, net $ (36) $ 1