Benefit Plans (Tables)

6 Months Ended

Jul. 28, 2012

Pension and Other Postretirement Benefit Expense [Abstract]

Schedule of Net Periodic Benefit Costs

The actuarially determined components of the net periodic benefit cost are as follows:

	13 Weeks Ended						26 Weeks Ended
	July 28, 2012			July 30, 2011			July 28, 2012			July 30, 2011
	(millions)
Pension Plan
Service cost	$	30		$	25		$	58		$	51
Interest cost	39			40			78			80
Expected return on assets	(63		)	(62		)	(126		)	(124		)
Recognition of net actuarial loss	36			23			71			44
Amortization of prior service credit	—			—			—			—
	$	42		$	26		$	81		$	51
Supplementary Retirement Plan
Service cost	$	1		$	2		$	3		$	3
Interest cost	9			9			17			18
Recognition of net actuarial loss	5			2			9			4
Amortization of prior service credit	—			(1		)	—			(1		)
	$	15		$	12		$	29		$	24
Postretirement Obligations
Service cost	$	—		$	—		$	—		$	—
Interest cost	3			3			6			7
Recognition of net actuarial gain	(1		)	(2		)	(2		)	(3		)
Amortization of prior service cost	—			—			—			—
	$	2		$	1		$	4		$	4