Pension, Postretirement Health Care and Other Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 03, 2013	Jul. 28, 2012	Aug. 03, 2013	Jul. 28, 2012
Pension Benefits
Net Pension and Postretirement Health Care Benefits Expense
Service cost	$ 29	$ 30	$ 59	$ 60
Interest cost	34	35	69	70
Expected return on assets	(58)	(55)	(117)	(110)
Amortization of losses	25	26	50	52
Amortization of prior service cost	(2)		(5)
Total Net Pension and Postretirement Health Care Benefits Expense	28	36	56	72
Postretirement Health Care Benefits
Net Pension and Postretirement Health Care Benefits Expense
Service cost	1	2	3	4
Interest cost	1		1	1
Amortization of losses	2	1	3	2
Amortization of prior service cost	(4)	(2)	(8)	(4)
Total Net Pension and Postretirement Health Care Benefits Expense		$ 1	$ (1)	$ 3