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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 30, 2020
Nov. 01, 2019
Oct. 30, 2020
Nov. 01, 2019
Jan. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Deferred compensation plan assets $ 125   $ 125   $ 106
Discrete tax impact related to adjustment of investment at fair value 62        
Deferred compensation plan liabilities 125   125   106
Securities without readily determinable fair value 122   122   159
Unrealized gain (loss) on equity securities without readily determinable fair value (15) $ 12 (15) $ 35  
Level 2 | Notes payable | Dell          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 275   275   269
Level 2 | Senior Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 5,300   5,300   $ 4,100
Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment at fair value 214   $ 214    
Unrealized gain on adjustment of investments to fair value $ 189