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Guarantees (Tables)
 12 Months Ended
Jan. 28, 2018
Notes to financial statements [Abstract]  
Estimated Product Warranty Liabilities
 
January 28,
2018
 
January 29,
2017
 
(In millions)
Balance at beginning of period
$
8

 
$
11

Additions
14

 
2

Deductions
(7
)
 
(5
)
Balance at end of period 
$
15

 
$
8