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Comprehensive Income (Loss) - AOCI Components (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Oct. 24, 2020 | Oct. 26, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | $ 37,920 | $ 33,571
Other comprehensive income (loss) before reclassifications | 67 | (6)
(Gains) losses reclassified out of AOCI | (17) | (9)
Tax benefit (expense) | 22 | (8)
Ending balance | 38,157 | 34,423
Net Unrealized Gains (Losses) on Available-for-Sale Investments |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | 315 | 0
Other comprehensive income (loss) before reclassifications | (41) | 87
(Gains) losses reclassified out of AOCI | (15) | (10)
Tax benefit (expense) | 22 | (9)
Ending balance | 281 | 68
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (6) | (14)
Other comprehensive income (loss) before reclassifications | (2) | (1)
(Gains) losses reclassified out of AOCI | (2) | 0
Tax benefit (expense) | 1 | 1
Ending balance | (9) | (14)
Cumulative Translation Adjustment and Actuarial Gains (Losses) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (828) | (778)
Other comprehensive income (loss) before reclassifications | 110 | (92)
(Gains) losses reclassified out of AOCI | 0 | 1
Tax benefit (expense) | (1) | 0
Ending balance | (719) | (869)
Accumulated Other Comprehensive Income (Loss) |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (519) | (792)
Ending balance | $ (447) | $ (815)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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