Benefit Plans (Actuarially Determined Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2011	Jul. 31, 2010	Jul. 30, 2011	Jul. 31, 2010
Pension Plan [Member]
Service cost	$ 25	$ 26	$ 51	$ 50
Interest cost	40	40	80	79
Expected return on assets	(62)	(55)	(124)	(109)
Recognition of net actuarial (gain) loss	23	15	44	30
Amortization of prior service cost	0	0	0	0
Total	26	26	51	50
Supplementary Retirement Plan [Member]
Service cost	2	1	3	3
Interest cost	9	9	18	18
Recognition of net actuarial (gain) loss	2	1	4	2
Amortization of prior service cost	(1)	(1)	(1)	(1)
Total	12	10	24	22
Postretirement Obligations [Member]
Service cost	0	0	0	0
Interest cost	3	3	7	7
Recognition of net actuarial (gain) loss	(2)	(1)	(3)	(2)
Amortization of prior service cost	0	0	0	0
Total	$ 1	$ 2	$ 4	$ 5