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Benefit Plans (Tables)
 6 Months Ended
Aug. 04, 2018
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Schedule of Costs of Retirement Plans
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
 
26 Weeks Ended
 
August 4, 2018
 
July 29, 2017
 
August 4, 2018
 
July 29, 2017
 
(millions)
 
(millions)
401(k) Qualified Defined Contribution Plan
$
24

 
$
24

 
$
47

 
$
45

 
 
 
 
 
 
 
 
Non-Qualified Defined Contribution Plan
$
1

 
$
—

 
$
1

 
$
—

 
 
 
 
 
 
 
 
Pension Plan
 
 
 
 
 
 
 
Service cost
$
1

 
$
2

 
$
3

 
$
3

Interest cost
27

 
27

 
53

 
54

Expected return on assets
(53
)
 
(57
)
 
(106
)
 
(113
)
Recognition of net actuarial loss
8

 
8

 
16

 
16

Amortization of prior service credit
—

 
—

 
—

 
—

 
$
(17
)
 
$
(20
)
 
$
(34
)
 
$
(40
)
Supplementary Retirement Plan
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
5

 
5

 
11

 
11

Recognition of net actuarial loss
2

 
2

 
4

 
4

Amortization of prior service cost
—

 
—

 
—

 
—

 
$
7

 
$
7

 
$
15

 
$
15

 
 
 
 
 
 
 
 
Total Retirement Expense
$
15

 
$
11

 
$
29

 
$
20

 
 
 
 
 
 
 
 
Postretirement Obligations
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
1

 
2

 
2

 
3

Recognition of net actuarial gain
(1
)
 
(1
)
 
(2
)
 
(2
)
Amortization of prior service credit
—

 
—

 
—

 
—

 
$
—

 
$
1

 
$
—

 
$
1