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Guarantees (Tables)
 12 Months Ended
Jan. 29, 2017
Notes to financial statements [Abstract]  
Estimated Product Warranty Liabilities
 
January 29,
2017
 
January 31,
2016
 
January 25,
2015
 
(In millions)
Balance at beginning of period
$
11

 
$
8

 
$
8

Additions
2

 
27

 
5

Deductions
(5
)
 
(24
)
 
(5
)
Balance at end of period 
$
8

 
$
11

 
$
8