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Fair Value of Financial Assets and Liabilities (Tables)
 3 Months Ended
Apr. 29, 2018
Notes to financial statements [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
 
 
Fair Value at
 
Pricing Category
 
April 29, 2018
 
January 28, 2018
 
 
 
(In millions)
Assets
 
 
 
 
 
Cash equivalents and marketable securities:
 
 
 
Debt securities issued by the United States Treasury
Level 2
 
$
2,737

 
$
573

Corporate debt securities
Level 2
 
$
1,792

 
$
1,295

Debt securities of United States government agencies
Level 2
 
$
1,727

 
$
815

Money market funds
Level 1
 
$
460

 
$
3,789

Asset-backed securities
Level 2
 
$
227

 
$
252

Mortgage-backed securities issued by United States government-sponsored enterprises
Level 2
 
$
121

 
$
130

Foreign government bonds
Level 2
 
$
31

 
$
41

 
 
 
 
 
 
Liabilities
 
 
 
 
 
Current liability:
 
 
 
 
 
1.00% Convertible Senior Notes (1)
Level 2
 
$
159

 
$
189

Other noncurrent liabilities:
 
 
 
 
 
2.20% Notes Due 2021 (1)
Level 2
 
$
972

 
$
982

3.20% Notes Due 2026 (1)
Level 2
 
$
954

 
$
986