Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Feb. 01, 2020	Feb. 02, 2019
Marketable equity and debt securities	$ 132	$ 101
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Marketable equity and debt securities	34	27
Significant Observable Inputs (Level 2) [Member]
Marketable equity and debt securities	98	74
Significant Unobservable Inputs (Level 3) [Member]
Marketable equity and debt securities	$ 0	$ 0