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Benefit Plans
 3 Months Ended
May 05, 2018
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Benefit Plans
Benefit Plans
The Company has defined contribution plans which cover substantially all employees who work 1,000 hours or more in a year. In addition, the Company has a funded defined benefit plan ("Pension Plan") and an unfunded defined benefit supplementary retirement plan ("SERP"), which provides benefits, for certain employees, in excess of qualified plan limitations. Effective January 1, 2012, the Pension Plan was closed to new participants, with limited exceptions, and effective January 2, 2012, the SERP was closed to new participants.
In February 2013, the Company announced changes to the Pension Plan and SERP whereby eligible employees no longer earn future pension service credits after December 31, 2013, with limited exceptions. All retirement benefits attributable to service in subsequent periods are provided through defined contribution plans.
In addition, certain retired employees currently are provided with specified health care and life insurance benefits ("Postretirement Obligations"). Eligibility requirements for such benefits vary, but generally state that benefits are available to eligible employees who were hired prior to a certain date and retire after a certain age with specified years of service. Certain employees are subject to having such benefits modified or terminated.
The defined contribution plan expense and actuarially determined components of the net periodic benefit cost (income) associated with the defined benefit plans are as follows:
 
13 weeks ended
 
May 5, 2018
 
April 29, 2017
 
(millions)
401(k) Qualified Defined Contribution Plan
$
23

 
$
21

 
 
 
 
Non-Qualified Defined Contribution Plan
$
—

 
$
—

 
 
 
 
Pension Plan
 
 
 
Service cost
$
2

 
$
1

Interest cost
26

 
27

Expected return on assets
(53
)
 
(56
)
Recognition of net actuarial loss
8

 
8

Amortization of prior service credit
—

 
—

 
$
(17
)
 
$
(20
)
Supplementary Retirement Plan
 
 
 
Service cost
$
—

 
$
—

Interest cost
6

 
6

Recognition of net actuarial loss
2

 
2

Amortization of prior service cost
—

 
—

 
$
8

 
$
8

 
 
 
 
Total Retirement Expense
$
14

 
$
9

 
 
 
 
Postretirement Obligations
 
 
 
Service cost
$
—

 
$
—

Interest cost
1

 
1

Recognition of net actuarial gain
(1
)
 
(1
)
Amortization of prior service credit
—

 
—

 
$
—

 
$
—