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Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Jul. 31, 2021
Aug. 01, 2020
Goodwill and Intangible Assets [Abstract]        
Amortization expense $ 20 $ 20 $ 40 $ 40