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Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Apr. 30, 2017
Jan. 29, 2017
Financial assets and liabilities measured at fair value:    
Stated interest rate, Convertible Notes 1.00%  
2021 Notes [Member]    
Financial assets and liabilities measured at fair value:    
Long-term Debt, Stated interest rate 2.20%  
2026 Notes [Member]    
Financial assets and liabilities measured at fair value:    
Long-term Debt, Stated interest rate 3.20%  
Fair Value, Inputs, Level 1 [Member] | Money market funds    
Financial assets and liabilities measured at fair value:    
Assets, fair value $ 41 $ 321
Fair Value, Inputs, Level 2 [Member]    
Financial assets and liabilities measured at fair value:    
Convertible Notes, Fair Value [1] 1,149 4,474
Interest rate swap [2] 3 2
Fair Value, Inputs, Level 2 [Member] | 2021 Notes [Member]    
Financial assets and liabilities measured at fair value:    
Long-term Debt, Fair Value [1] 987 975
Fair Value, Inputs, Level 2 [Member] | 2026 Notes [Member]    
Financial assets and liabilities measured at fair value:    
Long-term Debt, Fair Value [1] 979 961
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities    
Financial assets and liabilities measured at fair value:    
Assets, fair value 1,860 2,388
Fair Value, Inputs, Level 2 [Member] | Debt securities of United States government agencies    
Financial assets and liabilities measured at fair value:    
Assets, fair value 1,062 1,188
Fair Value, Inputs, Level 2 [Member] | Debt securities issued by the United States Treasury    
Financial assets and liabilities measured at fair value:    
Assets, fair value 681 850
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities    
Financial assets and liabilities measured at fair value:    
Assets, fair value 380 489
Fair Value, Inputs, Level 2 [Member] | Mortgage backed securities issued by United States government-sponsored enterprises    
Financial assets and liabilities measured at fair value:    
Assets, fair value 170 162
Fair Value, Inputs, Level 2 [Member] | Foreign government bonds    
Financial assets and liabilities measured at fair value:    
Assets, fair value $ 64 $ 70
[1] The remaining 1.00% Convertible Notes, 2.20% Notes Due 2021, and 3.20% Notes Due 2026 are carried on our Condensed 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 Condensed Consolidated Financial Statements for additional information.
[2] Please refer to Note 9 of these Notes to Condensed Consolidated Financial Statements for a discussion regarding our interest rate swap.