Fair Value Measurements (Details 1) - USD ($) $ in Millions	Apr. 29, 2016	Jan. 29, 2016	May. 01, 2015
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	$ 14,870	$ 12,080	$ 10,868
Unsecured Notes [Member]
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	14,863	12,073	10,852
Mortgage Notes [Member]
Financial Instruments
Long-term debt carrying value (excluding capitalized lease obligations)	7	7	16
Estimate of Fair Value [Member]
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	16,540	13,300	12,248
Estimate of Fair Value [Member] | Unsecured Notes [Member] | Fair Value (Level 1) [Member]
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	16,532	13,292	12,231
Estimate of Fair Value [Member] | Mortgage Notes [Member] | Fair Value (Level 2) [Member]
Financial Instruments
Long-term debt fair value (excluding capitalized lease obligations)	$ 8	$ 8	$ 17