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Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 28, 2018
Oct. 29, 2017
Jul. 30, 2017
Apr. 30, 2017
Jan. 29, 2017
Oct. 30, 2016
Jul. 31, 2016
May 01, 2016
Jan. 28, 2018
Jan. 29, 2017
Jan. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets $ 22,075       $ 21,914       $ 22,075 $ 21,914 $ 22,191
Net sales 23,883 $ 25,026 $ 28,108 $ 23,887 22,207 $ 23,154 $ 26,472 $ 22,762 100,904 94,595 88,519
Inside the U.S. [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets 19,526       19,519       19,526 19,519 19,846
Net sales                 92,413 86,615 80,550
Outside the U.S. [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-lived assets $ 2,549       $ 2,395       2,549 2,395 2,345
Net sales                 $ 8,491 $ 7,980 $ 7,969