Leases - ROU Assets and Lease Liabilities (Details) $ in Millions	Sep. 26, 2020 USD ($)
Lease-Related Assets and Liabilities
Operating lease right-of-use assets	$ 8,570
Operating lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Finance lease right-of-use assets	$ 629
Finance lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Total right-of-use assets	$ 9,199
Operating lease liabilities, current	$ 1,436
Operating lease, liability, current, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities, non-current	$ 7,745
Operating lease, liability, noncurrent, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance lease liabilities, current	$ 24
Finance lease, liability, current, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Finance lease liabilities, non-current	$ 637
Finance lease, liability, noncurrent, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities	$ 9,842