Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Lessee, Lease, Description [Line Items]
Operating Leases, Rent Expense		$ 771	$ 742
Lessee, Operating Lease, Option to Extend	five years
Lessee, Operating Lease, Option to Terminate	one year
Operating Lease, Cost	$ 474
Variable Lease, Cost	101
Short-term Lease, Cost	379
lessee, operating lease, amortization amount included in operating lease cost	412
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	479
Operating Lease, Payments	478
Operating Lease, Right-of-Use Asset	1,548	0
Operating Lease, Liability, Current	442	0
Operating Lease, Liability, Noncurrent	1,118
Operating Lease, Liability	$ 1,560
Operating Lease, Weighted Average Discount Rate, Percent	4.00%
Operating Lease, Weighted Average Remaining Lease Term	6 years
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 501
Lessee, Operating Lease, Liability, Payments, Due Year Two	374
Lessee, Operating Lease, Liability, Payments, Due Year Three	280
Lessee, Operating Lease, Liability, Payments, Due Year Four	183
Lessee, Operating Lease, Liability, Payments, Due Year Five	117
Lessee, Operating Lease, Liability, Payments, Due after Year Five	308
Lessee, Operating Lease, Liability, Payments, Due	1,763
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	203
Operating Leases, Future Minimum Payments Due, Next Twelve Months		459
Operating Leases, Future Minimum Payments, Due in Two Years		406
Operating Leases, Future Minimum Payments, Due in Three Years		294
Operating Leases, Future Minimum Payments, Due in Four Years		210
Operating Leases, Future Minimum Payments, Due in Five Years		161
Operating Leases, Future Minimum Payments, Due Thereafter		310
Operating Leases, Future Minimum Payments Due		$ 1,840
Sale and Leaseback Transaction, Gain (Loss), Net	$ 77
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	20 years