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Comprehensive Income (Loss) - AOCI Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 29, 2023 | Jul. 30, 2022 | Jul. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | $ 39,773 | $ 41,275 | $ 37,920
Other comprehensive income (loss) before reclassifications | 32 | (1,291) | 108
(Gains) losses reclassified out of AOCI | (43) | (36) | (64)
Tax benefit (expense) | 58 | 122 | 58
Balance, end of period | 44,353 | 39,773 | 41,275
Net Unrealized Gains (Losses) on Available-for-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (379) | 182 | 315
Other comprehensive income (loss) before reclassifications | (113) | (731) | (141)
(Gains) losses reclassified out of AOCI | 21 | (9) | (53)
Tax benefit (expense) | 31 | 179 | 61
Balance, end of period | (440) | (379) | 182
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | 44 | (1) | (6)
Other comprehensive income (loss) before reclassifications | 29 | 87 | 20
(Gains) losses reclassified out of AOCI | (63) | (29) | (14)
Tax benefit (expense) | 8 | (13) | (1)
Balance, end of period | 18 | 44 | (1)
Cumulative Translation Adjustment and Actuarial Gains (Losses) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (1,287) | (598) | (828)
Other comprehensive income (loss) before reclassifications | 116 | (647) | 229
(Gains) losses reclassified out of AOCI | (1) | 2 | 3
Tax benefit (expense) | 19 | (44) | (2)
Balance, end of period | (1,153) | (1,287) | (598)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (1,622) | (417) | (519)
Balance, end of period | $ (1,575) | $ (1,622) | $ (417)

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