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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Federal:      
Current $ 1,959 $ 1,101 $ 1,760
Deferred (203) (374) (84)
Total 1,756 727 1,676
State:      
Current 513 264 302
Deferred (46) 287 (2)
Total 467 551 300
Foreign:      
Current 583 1,429 1,238
Deferred (135) 49 (264)
Total 448 1,478 974
Total $ 2,671 $ 2,756 $ 2,950