Stockholders' Equity (Tables)
 3 Months Ended
Apr. 30, 2016
Stockholders' Equity Note [Abstract]  
Schedule of Components in Stockholders' Equity
The following table shows the change in the components of stockholders’ equity for the three months ended April 30, 2016:
 
(in millions)
Number
of
Common
Shares
 
Common
Stock
 
Additional
Paid-in
Capital
 
Reinvested
Earnings/
(Accumulated
Deficit)
 
Accumulated
Other
Comprehensive
Income/(Loss)
 
Total
Stockholders’
Equity
January 30, 2016
306.1

 
$
153

 
$
4,654

 
$
(3,007
)
 
$
(491
)
 
$
1,309

Net income/(loss)
—

 
—

 
—

 
(68
)
 
—

 
(68
)
Other comprehensive income/(loss)
—

 
—

 
—

 
—

 
3

 
3

Stock-based compensation
1.2

 
1

 
5

 
—

 
—

 
6

April 30, 2016
307.3

 
$
154

 
$
4,659

 
$
(3,075
)
 
$
(488
)
 
$
1,250
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)
The following table shows the changes in accumulated other comprehensive income/(loss) balances for the three months ended April 30, 2016:
($ in millions)
Net  Actuarial
Gain/(Loss)
 
Prior Service
Credit/(Cost)
 
Foreign Currency Translation
 
Gain/(Loss) on Cash Flow Hedges
 
Accumulated
Other
Comprehensive
Income/(Loss)
January 30, 2016
$
(423
)
 
$
(38
)
 
$
(2
)
 
$
(28
)
 
$
(491
)
Other comprehensive income/(loss) before reclassifications
—

 
5

 
—

 
(3
)
 
2

Amounts reclassified from accumulated other comprehensive income
(1
)
 
—

 
—

 
2

 
1

April 30, 2016
$
(424
)
 
$
(33
)
 
$
(2
)
 
$
(29
)
 
$
(488
)