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Fair Value Measurements Fair Value Measurements (Securities Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 03, 2018
Nov. 03, 2018
Oct. 28, 2017
Feb. 03, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unrealized Gain (Loss) on Securities $ 2 $ 8 $ 0  
Investments, Fair Value Disclosure 9 9 6 $ 17
Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments, Fair Value Disclosure $ 9 $ 9 $ 6 $ 17