Fair Value Measurements - Other Fair Value Disclosures (Details) - USD ($) $ in Millions	Oct. 30, 2020	Jan. 31, 2020	Nov. 01, 2019
Financial Instruments
Long-term debt carrying value (excluding finance lease obligations)	$ 21,124	$ 16,653	$ 16,651
Unsecured Notes
Financial Instruments
Long-term debt carrying value (excluding finance lease obligations)	21,119	16,648	16,646
Mortgage Notes
Financial Instruments
Long-term debt carrying value (excluding finance lease obligations)	5	5	5
Estimate of Fair Value
Financial Instruments
Long-term debt fair value (excluding finance lease obligations)	24,345	18,814	18,189
Estimate of Fair Value | Unsecured Notes | Fair Value (Level 1)
Financial Instruments
Long-term debt fair value (excluding finance lease obligations)	24,340	18,808	18,184
Estimate of Fair Value | Mortgage Notes | Fair Value (Level 2)
Financial Instruments
Long-term debt fair value (excluding finance lease obligations)	$ 5	$ 6	$ 5