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Discontinued Operations (Tables)
9 Months Ended
Oct. 28, 2017
Discontinued Operations and Disposal Groups [Abstract]  
Financial results of discontinued operations
The aggregate financial results of discontinued operations were as follows ($ in millions):
 
Three Months Ended
 
Nine Months Ended
 
October 28, 2017
 
October 29, 2016
 
October 28, 2017
 
October 29, 2016
Gain from discontinued operations before income tax expense
$
1

 
$
2

 
$
1

 
$
28

Income tax expense

 

 

 
7

Net gain from discontinued operations
$
1

 
$
2

 
$
1

 
$
21