Minimum lease liability ASC 842 (Details) - USD ($) $ in Millions	Aug. 03, 2019	Feb. 03, 2019	Feb. 02, 2019	Aug. 04, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Year Two	$ 1,150
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	608
Lessee, Operating Lease, Liability, Payments, Due Year Three	1,024
Lessee, Operating Lease, Liability, Payments, Due Year Four	913
Lessee, Operating Lease, Liability, Payments, Due Year Five	811
Operating Leases, Future Minimum Payments Receivable, Thereafter	3,665
Lessee, Operating Lease, Liability, Payments, Due	8,171
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(1,581)
Operating Lease, Liability, Current	(946)		$ 0	$ 0
Operating Lease, Liability	6,590	$ 6,600
Operating Lease, Liability, Noncurrent	$ 5,644		$ 0	$ 0