Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring and Nonrecurring Basis) (Details) - USD ($) $ in Millions	Jan. 29, 2022	Jan. 30, 2021
Marketable equity and debt securities	$ 39	$ 100
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Marketable equity and debt securities	39	37
Significant Observable Inputs (Level 2) [Member]
Marketable equity and debt securities	0	63
Significant Unobservable Inputs (Level 3) [Member]
Marketable equity and debt securities	$ 0	$ 0