Fair Value of Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Jan. 28, 2018

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 28, 2018		January 29, 2017
		(In millions)
Assets
Cash equivalents and marketable securities:
Money market funds	Level 1	$	3,789	$	321
Corporate debt securities	Level 2	$	1,295	$	2,388
Debt securities of U.S. government agencies	Level 2	$	815	$	1,188
Debt securities issued by the United States Treasury	Level 2	$	573	$	850
Asset-backed securities	Level 2	$	252	$	489
Mortgage-backed securities issued by United States government-sponsored enterprises	Level 2	$	130	$	162
Foreign government bonds	Level 2	$	41	$	70
Liabilities
Current liability:
1.00% Convertible Senior Notes (1)	Level 2	$	189	$	4,474
Other noncurrent liabilities:
2.20% Notes Due 2021 (1)	Level 2	$	982	$	975
3.20% Notes Due 2026 (1)	Level 2	$	986	$	961
Interest rate swap (2)	Level 2	$	—	$	2

(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.

(2) In January 2018, we terminated the interest rate swap. Refer to Note 9 of these Notes to Consolidated Financial Statements for additional information.