Pension and Postretirement Plans (Tables)

9 Months Ended

Oct. 29, 2016

Pension and Postretirement Plans [Abstract]

Net Benefit Expense (Income)

The following are the components of net periodic pension benefit cost and net periodic postretirement benefit income, which are recognized as part of SG&A expense:

	Pension Benefits								Postretirement Benefits
	Thirteen weeks ended				Thirty-nine weeks ended				Thirteen weeks ended				Thirty-nine weeks ended
	Oct. 29,		Oct. 31,		Oct. 29,		Oct. 31,		Oct. 29,		Oct. 31,		Oct. 29,		Oct. 31,
($ in millions)	2016		2015		2016		2015		2016		2015		2016		2015
Service cost	$	4	$	5	$	12	$	13	$	—	$	—	$	—	$	—
Interest cost		6		6		19		18		1		—		1		1
Expected return on plan assets		(9)		(10)		(27)		(29)		—		—		—		—
Amortization of net loss (gain)		4		3		11		10		(1)		—		(2)		(1)
Net benefit expense (income)	$	5	$	4	$	15	$	12	$	—	$	—	$	(1)	$	—