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Shareholders' Equity - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 27, 2019 | Apr. 27, 2019 | Jan. 26, 2019 | Oct. 27, 2018 | Jul. 28, 2018 | Apr. 28, 2018 | Jan. 27, 2018 | Oct. 28, 2017 | Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017 | Feb. 13, 2019
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid per common share (in dollars per share) | $ 0.35 | $ 0.35 | $ 0.33 | $ 0.33 | $ 0.33 | $ 0.33 | $ 0.29 | $ 0.29 | $ 1.36 | $ 1.24 | $ 1.1 |
Payments of dividends |  |  |  |  |  |  |  |  | $ 5,979,000,000 | $ 5,968,000,000 | $ 5,511,000,000 |
Authorized additional repurchase amount |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000,000
Remaining authorized repurchase amount | $ 13,500,000,000 |  |  |  |  |  |  |  | 13,500,000,000 |  |  |
Stock repurchase program |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases pending settlement | $ 40,000,000 |  |  |  | $ 180,000,000 |  |  |  | $ 40,000,000 | $ 180,000,000 | $ 66,000,000 |

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