XML 66 R54.htm IDEA: XBRL DOCUMENT v3.10.0.1
Fair Value Measurements Fair Value Measurements (Securities Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 04, 2018
Aug. 04, 2018
Jul. 29, 2017
Feb. 03, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unrealized Gain (Loss) on Securities $ 6 $ 6 $ 0  
Investments, Fair Value Disclosure 11 11 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 $ 11 $ 11 $ 6 $ 17