Retirement Plans and Other Benefits (Tables)

6 Months Ended

Jul. 30, 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 is recognized as part of SG&A expense:

	Pension Benefits								Postretirement Benefits
	Thirteen weeks ended				Twenty-six weeks ended				Thirteen weeks ended				Twenty-six weeks ended
	July 30,		August 1,		July 30,		August 1,		July 30,		August 1,		July 30,		August 1,
($ in millions)	2016		2015		2016		2015		2016		2015		2016		2015
Service cost	$	4	$	4	$	8	$	8	$	—	$	—	$	—	$	—
Interest cost		7		6		13		12		—		1		—		1
Expected return on plan assets		(9)		(10)		(18)		(19)		—		—		—		—
Amortization of net loss (gain)		3		4		7		7		—		(1)		(1)		(1)
Net benefit expense (income)	$	5	$	4	$	10	$	8	$	—	$	—	$	(1)	$	—