Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Feb. 16, 2020	Feb. 16, 2020	Sep. 01, 2019
Lessee, Lease, Description [Line Items]
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$ 101	$ 101	$ 105
Operating Leases, Future Minimum Payments Receivable, Current			239
Finance Lease, Liability, Payments, Due Next Twelve Months			51
Operating Lease, Weighted Average Remaining Lease Term	22 years	22 years
Operating Lease, Payments		$ 93
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 120	120
Finance Lease, Liability, Payments, Remainder of Fiscal Year	23	23
Operating Lease, Cost	51	102
Operating Lease, Right-of-Use Asset	2,596	2,596	0
Finance Lease, Right-of-Use Asset	523	523
Operating Lease, Liability, Current	168	168
Finance Lease, Liability, Current	18	18
Operating Lease, Liability, Noncurrent	2,446	2,446	0
Finance Lease, Liability, Noncurrent	544	544
Finance Lease, Right-of-Use Asset, Amortization	4	8
Finance Lease, Interest Expense	8	15
Variable Lease, Cost	22	36
Lease, Cost	85	161
Lessee, Operating Lease, Liability, Payments, Due Year Two	220	220
Finance Lease, Liability, Payments, Due Year Two	47	47	53
Lessee, Operating Lease, Liability, Payments, Due Year Three	212	212
Finance Lease, Liability, Payments, Due Year Three	47	47	38
Lessee, Operating Lease, Liability, Payments, Due Year Four	219	219
Finance Lease, Liability, Payments, Due Year Four	51	51	39
Lessee, Operating Lease, Liability, Payments, Due Year Five	194	194
Finance Lease, Liability, Payments, Due Year Five	47	47	39
Lessee, Operating Lease, Liability, Payments, Due after Year Five	2,462	2,462
Finance Lease, Liability, Payments, Due after Year Five	723	723	544
Lessee, Operating Lease, Liability, Payments, Due	3,427	3,427
Finance Lease, Liability, Payment, Due	938	938	764
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	813	813
Finance Lease, Liability, Undiscounted Excess Amount	376	376	343
Operating Lease, Liability	2,614	2,614
Finance Lease, Liability	$ 562	562	421
Finance Lease, Interest Payment on Liability		15
Finance Lease, Principal Payments		$ 34
Finance Lease, Weighted Average Remaining Lease Term	19 years	19 years
Operating Lease, Weighted Average Discount Rate, Percent	2.24%	2.24%
Finance Lease, Weighted Average Discount Rate, Percent	7.24%	7.24%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 47
Operating Leases, Future Minimum Payments, Due in Two Years			229
Operating Leases, Future Minimum Payments, Due in Three Years			202
Operating Leases, Future Minimum Payments, Due in Four Years			193
Operating Leases, Future Minimum Payments, Due in Five Years			181
Operating Leases, Future Minimum Payments, Due Thereafter			2,206
Operating Leases, Future Minimum Payments Due			$ 3,250
COST_OperatingLeaseandFinanceLeaseLiabilities	$ 3,176	3,176
COST_OperatingLeaseandFinanceLeaserightofuseassets	3,119	3,119
COST_LesseeOperatingLeaseNotYetCommenced	$ 185	185
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		$ 167