Leases - ROU Assets and Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 25, 2021	Sep. 26, 2020
Lease-Related Assets and Liabilities
Operating lease right-of-use assets	$ 10,087	$ 8,570
Operating lease right-of-use assets, financial statement line item [Extensible Enumeration]	Other non-current assets	Other non-current assets
Finance lease right-of-use assets	$ 861	$ 629
Finance lease right-of-use assets, financial statement line item [Extensible Enumeration]	Property, plant and equipment, net	Property, plant and equipment, net
Total right-of-use assets	$ 10,948	$ 9,199
Operating lease liabilities, current	$ 1,449	$ 1,436
Operating lease liabilities, current, financial statement line item [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating lease liabilities, non-current	$ 9,506	$ 7,745
Operating lease liabilities, non-current, financial statement line item [Extensible Enumeration]	Other non-current liabilities	Other non-current liabilities
Finance lease liabilities, current	$ 79	$ 24
Finance lease liabilities, current, financial statement line item [Extensible Enumeration]	Other current liabilities	Other current liabilities
Finance lease liabilities, non-current	$ 769	$ 637
Finance lease liabilities, non-current, financial statement line item [Extensible Enumeration]	Other non-current liabilities	Other non-current liabilities
Total lease liabilities	$ 11,803	$ 9,842