Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Feb. 02, 2019	Feb. 03, 2018
Marketable equity and debt securities	$ 101	$ 117
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Marketable equity and debt securities	27	25
Significant Observable Inputs (Level 2) [Member]
Marketable equity and debt securities	74	92
Significant Unobservable Inputs (Level 3) [Member]
Marketable equity and debt securities	$ 0	$ 0