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Comprehensive Income (Loss) - AOCI components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | $ 43,204 |  |
Other comprehensive income (loss) | 225 | $ (940) | $ 373
Effect of adoption of accounting standards | 3,729 | 9 |
Balance, end of period | 33,571 | 43,204 |
Net Unrealized Gains (Losses) on Available-for-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (310) | 373 | 413
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc. | 560 | (543) | (164)
(Gains) losses reclassified out of AOCI | 13 | (287) | 87
Tax benefit (expense) | (95) | 93 | 37
Other comprehensive income (loss) | 478 | (737) | (40)
Effect of adoption of accounting standards | (168) | 54 |
Balance, end of period | 0 | (310) | 373
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (11) | 32 | (59)
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc. | 0 | 21 | 22
(Gains) losses reclassified out of AOCI | (3) | (68) | 79
Tax benefit (expense) | 0 | 4 | (10)
Other comprehensive income (loss) | (3) | (43) | 91
Effect of adoption of accounting standards | 0 | 0 |
Balance, end of period | (14) | (11) | 32
Cumulative Translation Adjustment and Actuarial Gains and Losses |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (528) | (359) | (680)
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc. | (267) | (159) | 318
(Gains) losses reclassified out of AOCI | 2 | 7 | 16
Tax benefit (expense) | 15 | (8) | (13)
Other comprehensive income (loss) | (250) | (160) | 321
Effect of adoption of accounting standards | 0 | (9) |
Balance, end of period | (778) | (528) | (359)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (849) | 46 | (326)
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc. | 293 | (681) | 176
(Gains) losses reclassified out of AOCI | 12 | (348) | 182
Tax benefit (expense) | (80) | 89 | 14
Other comprehensive income (loss) | 225 | (940) | 372
Effect of adoption of accounting standards | (168) | 45 |
Balance, end of period | $ (792) | $ (849) | $ 46

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