Pension, Postretirement Health Care and Other Benefits (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 30, 2011	Jul. 31, 2010	Jul. 30, 2011	Jul. 31, 2010
Pension Benefits
Net Pension and Postretirement Health Care Benefits Expense
Service cost	$ 29,000,000	$ 29,000,000	$ 58,000,000	$ 58,000,000
Interest cost	35,000,000	32,000,000	69,000,000	64,000,000
Expected return on assets	(51,000,000)	(48,000,000)	(102,000,000)	(96,000,000)
Recognized losses	18,000,000	11,000,000	34,000,000	22,000,000
Recognized prior service cost	(1,000,000)		(2,000,000)	(1,000,000)
Total Net Pension and Postretirement Health Care Benefits Expense	30,000,000	24,000,000	57,000,000	47,000,000
Postretirement Health Care Benefits
Net Pension and Postretirement Health Care Benefits Expense
Service cost	2,000,000	3,000,000	4,000,000	5,000,000
Interest cost	1,000,000	1,000,000	2,000,000	2,000,000
Recognized losses	1,000,000	1,000,000	2,000,000	2,000,000
Recognized prior service cost	(2,000,000)	(3,000,000)	(4,000,000)	(5,000,000)
Total Net Pension and Postretirement Health Care Benefits Expense	$ 2,000,000	$ 2,000,000	$ 4,000,000	$ 4,000,000