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Fair Value of Financial Assets and Liabilities (Tables)
 12 Months Ended
Jan. 27, 2019
Fair Value Disclosures [Abstract]  
Schedule of fair value of financial assets and liabilities
 
 
Fair Value at
 
Pricing Category
 
January 27, 2019
 
January 28, 2018
 
 
 
(In millions)
Assets
 
 
 
 
 
Cash equivalents and marketable securities:
 
 
 
 
 
Corporate debt securities
Level 2
 
$
2,620

 
$
1,295

Debt securities of United States government agencies
Level 2
 
$
2,280

 
$
815

Debt securities issued by the United States Treasury
Level 2
 
$
1,492

 
$
573

Money market funds
Level 1
 
$
483

 
$
3,789

Foreign government bonds
Level 2
 
$
209

 
$
41

Asset-backed securities
Level 2
 
$
151

 
$
252

Mortgage-backed securities issued by United States government-sponsored enterprises
Level 2
 
$
89

 
$
130

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

 
$
189

Other noncurrent liabilities:
 
 
 
 
 
2.20% Notes Due 2021 (1)
Level 2
 
$
978

 
$
982

3.20% Notes Due 2026 (1)
Level 2
 
$
961

 
$
986


(1)
These liabilities are carried on our Consolidated Balance Sheets at their original issuance value, net of unamortized debt discount and issuance costs, and are not marked to fair value each period. Refer to Note 11 of these Notes to the Consolidated Financial Statements for additional information.