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Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2020
Aug. 02, 2019
Jul. 31, 2020
Aug. 02, 2019
Jan. 31, 2020
Revenue Recognition          
Anticipated sales returns $ 272 $ 232 $ 272 $ 232  
Right of return assets 173 152 173 152  
Up-front payment arrangement 1,300 875 1,300 875  
Liability for stored-value cards 433 449 433 449  
Deferred revenue from extended protection plans 981 868 981 868 $ 894
Deferred revenue from extended protection plans recognized in sales 101 101 208 200  
Recognized claim expense $ 42 $ 48 $ 78 $ 96