Leases - Schedule of other lease information (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Jan. 31, 2021 |
Jan. 26, 2020 |
|
| Lessee, Lease, Description [Line Items] | ||
| Operating cash flows used for operating leases | $ 141 | $ 103 |
| Operating lease assets obtained in exchange for lease obligations | 200 | $ 238 |
| Mellanox Technologies, Ltd | ||
| Lessee, Lease, Description [Line Items] | ||
| Operating lease assets obtained in exchange for lease obligations | $ 80 | |