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Benefit Plans (Tables)
 3 Months Ended
Apr. 30, 2016
Pension and Other Postretirement Benefit Expense [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
 
April 30, 2016
 
May 2, 2015
 
(millions)
401(k) Defined Contribution Plan
$
24

 
$
23

 
 
 
 
Pension Plan
 
 
 
Service cost
$
1

 
$
2

Interest cost
28

 
34

Expected return on assets
(56
)
 
(59
)
Recognition of net actuarial loss
8

 
10

Amortization of prior service credit
—

 
—

 
$
(19
)
 
$
(13
)
Supplementary Retirement Plan
 
 
 
Service cost
$
—

 
$
—

Interest cost
6

 
8

Recognition of net actuarial loss
2

 
3

Amortization of prior service cost
—

 
—

 
$
8

 
$
11

 
 
 
 
Total Retirement Expense
$
13

 
$
21

 
 
 
 
Postretirement Obligations
 
 
 
Service cost
$
—

 
$
—

Interest cost
2

 
2

Recognition of net actuarial gain
(1
)
 
—

Amortization of prior service cost
—

 
—

 
$
1

 
$
2