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Lease cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 02, 2019
Nov. 02, 2019
Leases [Abstract]    
Operating Lease, Cost $ 308 $ 905
Variable Lease, Cost 142 463
Sublease Income (2) (8)
Lease, Cost $ 448 $ 1,360