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Fair Value Measurements Fair Value Measurements (Securities Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
May 05, 2018
Feb. 03, 2018
Apr. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized Gain (Loss) on Securities $ 1    
Investments, Fair Value Disclosure 17 $ 17 $ 5
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, Fair Value Disclosure $ 17 $ 17 $ 5