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Fair Value of Cash Equivalents and Marketable Securities (Tables)
 12 Months Ended
Jan. 31, 2016
Notes to financial statements [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
Fair Value at
 
Pricing Category
 
January 31, 2016
 
January 25, 2015
 
 
 
(In millions)
Assets
 
 
 
 
 
Cash equivalents and Marketable securities:
 
 
 
 
 
Corporate debt securities (1)
Level 2
 
$
1,901

 
$
2,186

Debt securities of U.S. government agencies (2)
Level 2
 
$
1,170

 
$
750

Debt securities issued by the U.S. Treasury (3)
Level 2
 
$
801

 
$
537

Asset-backed securities (4)
Level 2
 
$
435

 
$
453

Mortgage-backed securities issued by government-sponsored enterprises (3)
Level 2
 
$
231

 
$
278

Foreign government bonds (3)
Level 2
 
$
92

 
$
85

Money market funds (5)
Level 1
 
$
43

 
$
132

 
 
 
 
 
 
Liabilities
 
 
 
 
 
Current liability:
 
 
 
 
 
1.00% Convertible Senior Notes Due 2018 (6)
Level 2
 
$
2,273

 
$
1,680

Other noncurrent liability:
 
 
 
 
 
Interest rate swap (7)
Level 2
 
$
(7
)
 
$
—


(1)
Includes $51 million and $147 million in cash equivalents as of January 31, 2016 and January 25, 2015, respectively, and $1.85 billion and $2.04 billion in marketable securities as of January 31, 2016 and January 25, 2015, respectively, on the Consolidated Balance Sheets.
(2)
Includes $90 million and $15 million in cash equivalents as of January 31, 2016 and January 25, 2015, respectively, and $1.08 billion and $735 million in marketable securities as of January 31, 2016 and January 25, 2015, respectively, on the Consolidated Balance Sheets.
(3)
In marketable securities on the Consolidated Balance Sheets.
(4)
Includes $435 million and $453 million in marketable securities as of January 31, 2016 and January 25, 2015, respectively, on the Consolidated Balance Sheets.
(5)
In cash equivalents on the Consolidated Balance Sheets.
(6)
The Notes are carried on our Consolidated Balance Sheets at their original issuance value, net of unamortized debt discount, and are not marked to fair value each period. Please refer to Note 11 of these Notes to the Consolidated Financial Statements for additional information on the Notes.
(7)
Please refer to Note 9 of these Notes to the Consolidated Financial Statements for a discussion regarding our interest rate swap.