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Guarantees (Tables)
3 Months Ended
Apr. 30, 2017
Notes to financial statements [Abstract]  
Guarantees
 
April 30,
 
January 29,
 
2017
 
2017
 
(In millions)
Balance at beginning of period
$
8

 
$
11

Additions

 
2

Deductions
(1
)
 
(5
)
Balance at end of period 
$
7

 
$
8