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Benefit Plans (Tables)
 6 Months Ended
Jul. 29, 2017
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
 
July 29, 2017
 
July 30, 2016
 
July 29, 2017
 
July 30, 2016
 
(millions)
 
(millions)
401(k) Qualified Defined Contribution Plan
$
24

 
$
25

 
$
45

 
$
49

 
 
 
 
 
 
 
 
Non-Qualified Defined Contribution Plan
$
—

 
$
1

 
$
—

 
$
1

 
 
 
 
 
 
 
 
Pension Plan
 
 
 
 
 
 
 
Service cost
$
2

 
$
1

 
$
3

 
$
2

Interest cost
27

 
28

 
54

 
56

Expected return on assets
(57
)
 
(58
)
 
(113
)
 
(114
)
Recognition of net actuarial loss
8

 
7

 
16

 
15

Amortization of prior service credit
—

 
—

 
—

 
—

 
$
(20
)
 
$
(22
)
 
$
(40
)
 
$
(41
)
Supplementary Retirement Plan
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
5

 
6

 
11

 
12

Recognition of net actuarial loss
2

 
2

 
4

 
4

Amortization of prior service cost
—

 
—

 
—

 
—

 
$
7

 
$
8

 
$
15

 
$
16

 
 
 
 
 
 
 
 
Total Retirement Expense
$
11

 
$
12

 
$
20

 
$
25

 
 
 
 
 
 
 
 
Postretirement Obligations
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
2

 
1

 
3

 
3

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

 
—

 
—

 
—

 
$
1

 
$
—

 
$
1

 
$
1