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Comprehensive Income (Loss) - AOCI components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 25, 2020 | Jul. 27, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | $ 37,920 | $ 33,571 | $ 43,204
Other comprehensive income (loss) before reclassifications | 108 | 376 | 293
(Gains) losses reclassified out of AOCI | (64) | (35) | 12
Tax benefit (expense) | 58 | (68) | (80)
Other comprehensive income (loss) | 102 | 273 | 225
Balance, end of period | 41,275 | 37,920 | 33,571
Net Unrealized Gains (Losses) on Available-for-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | 315 | 0 | (310)
Other comprehensive income (loss) before reclassifications | (141) | 420 | 560
(Gains) losses reclassified out of AOCI | (53) | (42) | 13
Tax benefit (expense) | 61 | (63) | (95)
Other comprehensive income (loss) |  |  | 478
Balance, end of period | 182 | 315 | 0
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period |  | (14) | (11)
Other comprehensive income (loss) before reclassifications |  |  | 0
(Gains) losses reclassified out of AOCI |  |  | (3)
Tax benefit (expense) |  |  | 0
Other comprehensive income (loss) |  |  | (3)
Balance, end of period |  |  | (14)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (6) |  |
Other comprehensive income (loss) before reclassifications | 20 | 7 |
(Gains) losses reclassified out of AOCI | (14) | 1 |
Tax benefit (expense) | (1) | 0 |
Balance, end of period | (1) | (6) |
Cumulative Translation Adjustment and Actuarial Gains and Losses |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (828) | (778) | (528)
Other comprehensive income (loss) before reclassifications | 229 | (51) | (267)
(Gains) losses reclassified out of AOCI | 3 | 6 | 2
Tax benefit (expense) | (2) | (5) | 15
Other comprehensive income (loss) |  |  | (250)
Balance, end of period | (598) | (828) | (778)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | (519) | (792) | (849)
Other comprehensive income (loss) | 102 | 273 | 225
Balance, end of period | (417) | (519) | (792)
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period | $ (38) |  | 3,729
Balance, end of period |  | $ (38) |
Cumulative Effect, Period of Adoption, Adjustment | Net Unrealized Gains (Losses) on Available-for-Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period |  |  | (168)
Cumulative Effect, Period of Adoption, Adjustment | Net Unrealized Gains (Losses) Cash Flow Hedging Instruments |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Cumulative Translation Adjustment and Actuarial Gains and Losses |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance, beginning of period |  |  | $ (168)

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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=124509347&loc=SL7669686-108580 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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