Leases and Other Commitments - Maturities of Lease Liabilities (Details) $ in Millions	Jan. 31, 2020 USD ($)
Operating Leases
Fiscal 2021	$ 819
Fiscal 2022	624
Fiscal 2023	448
Fiscal 2024	348
Fiscal 2025	285
Thereafter	1,020
Total minimum lease payments	3,544
Less: imputed interest	(349)
Total	3,195
Finance Leases
Fiscal 2021	67
Fiscal 2022	23
Fiscal 2023	23
Fiscal 2024	24
Fiscal 2025	24
Thereafter	410
Total minimum lease payments	571
Less: Imputed interest	(186)
Total	$ 385