v3.20.1
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