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Summary of Significant Accounting Policies - Recently Adopted and Issued Accounting Pronouncements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 02, 2020
Aug. 04, 2019
Aug. 02, 2020
Aug. 04, 2019
Feb. 02, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Selling, general and administrative $ 6,355 $ 5,044 $ 12,184 $ 9,984  
Accrued salaries and related expenses 2,402   2,402   $ 1,494
COVID-19 employee benefits          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Selling, general and administrative 479   1,300    
Accrued salaries and related expenses $ 393   $ 393