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Income taxes (Tables)
 9 Months Ended
Oct. 28, 2017
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The following table summarizes our Income tax expense and effective tax rates for the thirteen and thirty-nine weeks ended October 28, 2017 and October 29, 2016:
 
 
13 Weeks Ended
 
39 Weeks Ended
($ In millions)
 
October 28,
2017
 
October 29,
2016
 
October 28,
2017
 
October 29,
2016
Loss before income taxes
 
$
(622
)
 
$
(152
)
 
$
(862
)
 
$
(365
)
Income tax expense
 
—

 
3

 
88

 
8

Effective tax rate
 
—
%
 
(2.0
)%
 
(10.2
)%
 
(2.2
)%