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Comprehensive Income (Loss) - Reclassification out of other comprehensive income (Details) - USD ($) $ in Millions | 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 13,428 | $ 12,958 | $ 12,446 | $ 13,072 | $ 12,844 | $ 12,463 | $ 11,887 | $ 12,136 | $ 51,904 | $ 49,330 | $ 48,005
NET INCOME | $ 2,206 | $ 3,044 | $ 2,822 | $ 3,549 | $ 3,803 | $ 2,691 | $ (8,778) | $ 2,394 | 11,621 | 110 | 9,609
Total amounts reclassified out of AOCI |  |  |  |  |  |  |  |  | (12) | 348 | (182)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains and losses on available-for-sale investments |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (loss), net |  |  |  |  |  |  |  |  | (13) | 287 | (87)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains and losses on cash flow hedging instruments |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2 | 0 | 0
Cost of sales |  |  |  |  |  |  |  |  | 0 | 16 | (20)
Operating expenses |  |  |  |  |  |  |  |  | 1 | 52 | (59)
NET INCOME |  |  |  |  |  |  |  |  | 3 | 68 | (79)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income (loss), net |  |  |  |  |  |  |  |  | (2) | 0 | 0
Operating expenses |  |  |  |  |  |  |  |  | $ 0 | $ 7 | $ 16

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