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Shareholders' Equity - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 09, 2021 | Jan. 23, 2021 | Jan. 25, 2020 | Jan. 23, 2021 | Jan. 25, 2020 | Jul. 25, 2020
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends paid per common share (in dollars per share) |  | $ 0.36 | $ 0.35 | $ 0.72 | $ 0.70 |
Payments of dividends |  | $ 1,500,000,000 | $ 1,500,000,000 | $ 3,041,000,000 | $ 2,972,000,000 |
Remaining authorized repurchase amount |  | $ 9,200,000,000 |  | $ 9,200,000,000 |  |
Dividend declared (in dollars per share) |  | $ 0.36 | $ 0.35 | $ 0.72 | $ 0.70 |
Subsequent event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Dividend declared (in dollars per share) | $ 0.37 |  |  |  |  |
Stock repurchase program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchases pending settlement |  | $ 32,000,000 |  | $ 32,000,000 |  | $ 0

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