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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 28, 2018
Jan. 29, 2017
Jan. 31, 2016
Current:      
Federal $ 4,128 $ 3,870 $ 3,228
State 499 462 466
Foreign 331 315 296
Total Current 4,958 4,647 3,990
Deferred:      
Federal (67) (102) 21
State 89 13 10
Foreign 88 (24) (9)
Total Deferred 110 (113) 22
Provision for income taxes $ 5,068 $ 4,534 $ 4,012