Fair Value Measurements (Details 1) - USD ($) $ in Millions	May 03, 2019	Feb. 01, 2019	May 04, 2018
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	$ 17,096	$ 14,727	$ 14,969
Unsecured Notes
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	17,090	14,721	14,963
Mortgage Notes
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	6	6	6
Estimate of Fair Value
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	17,267	14,479	15,158
Estimate of Fair Value | Unsecured Notes | Fair Value (Level 1)
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	17,261	14,473	15,151
Estimate of Fair Value | Mortgage Notes | Fair Value (Level 2)
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	$ 6	$ 6	$ 7