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Fair Value of Cash Equivalents and Marketable Securities (Tables)
 12 Months Ended
Jan. 29, 2017
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 29, 2017
 
January 31, 2016
 
 
 
(In millions)
Assets
 
 
 
 
 
Cash equivalents and marketable securities:
 
 
 
 
 
Corporate debt securities (1)
Level 2
 
$
2,388

 
$
1,901

Debt securities of U.S. government agencies (2)
Level 2
 
$
1,188

 
$
1,170

Debt securities issued by the United States Treasury (3)
Level 2
 
$
850

 
$
801

Asset-backed securities (4)
Level 2
 
$
489

 
$
435

Money market funds (5)
Level 1
 
$
321

 
$
43

Mortgage-backed securities issued by United States government-sponsored enterprises (4)
Level 2
 
$
162

 
$
231

Foreign government bonds (4)
Level 2
 
$
70

 
$
92

 
 
 
 
 
 
Liabilities
 
 
 
 
 
Current liability:
 
 
 
 
 
1.00% Convertible Senior Notes (6)
Level 2
 
$
4,474

 
$
2,273

Other noncurrent liabilities:
 
 
 
 
 
2.20% Notes Due 2021 (6)
Level 2
 
$
975

 
$
—

3.20% Notes Due 2026 (6)
Level 2
 
$
961

 
$
—

Interest rate swap (7)
Level 2
 
$
2

 
$
7


(1)
Included $33 million and $51 million in cash equivalents as of January 29, 2017 and January 31, 2016, respectively, and $2.35 billion and $1.85 billion in marketable securities as of January 29, 2017 and January 31, 2016, respectively, on the Consolidated Balance Sheets.

(2)
Included $27 million and $90 million in cash equivalents as of January 29, 2017 and January 31, 2016, respectively, and $1.16 billion and $1.08 billion in marketable securities as of January 29, 2017 and January 31, 2016, respectively, on the Consolidated Balance Sheets.

(3)
Included $55 million in cash equivalents as of January 29, 2017 and $795 million and $801 million in marketable securities as of January 29, 2017 and January 31, 2016, respectively, on the Consolidated Balance Sheets.

(4)
Reported in marketable securities on the Consolidated Balance Sheets.

(5)
Reported in cash equivalents on the Consolidated Balance Sheets.

(6)
The 1.00% Convertible Notes, 2.20% Notes Due 2021, and 3.20% Notes Due 2026 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. See Note 11 of these Notes to the Consolidated Financial Statements for additional information.

(7)
Please refer to Note 9 of these Notes to Consolidated Financial Statements for a discussion regarding our interest rate swap.