Leases (Lease Assets and Liabilities) (Details) - USD ($) $ in Millions	May 01, 2020	Jan. 31, 2020
Operating Leases
ROU assets, non-current	$ 920	$ 886
Lease liabilities, current	101	109
Lease liabilities, non-current	787	746
Total lease liabilities	888	855
Finance Leases
ROU assets, non-current	57	58
Lease liabilities, current	4	4
Lease liabilities, non-current	52	55
Total lease liabilities	$ 56	$ 59