Financing (Interest Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Debt Disclosure [Abstract]
Interest on debt	$ 392	$ 393	$ 411
Amortization of debt premium	(22)	(21)	(12)
Amortization of financing costs	5	6	7
Interest on capitalized leases	2	2	2
Interest expense, gross	377	380	408
Less interest capitalized on construction	10	17	13
Interest Expense, Total	367	363	395
Premium on early retirement of long-term debt	$ 0	$ 0	$ 17