Fair Value Measurements (Details 2) - USD ($) $ in Millions	Feb. 01, 2019	Feb. 02, 2018
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	$ 14,727	$ 14,967
Unsecured notes
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	14,721	14,961
Mortgage notes
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	6	6
Estimate of Fair Value
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	14,479	15,615
Estimate of Fair Value | Unsecured notes | Level 1
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	14,473	15,608
Estimate of Fair Value | Mortgage notes | Level 2
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	$ 6	$ 7