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Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain/(Loss) Recognized in AOCI on Derivatives | $ (563) |  | $ (272) |
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded | 779 | $ 1,079 | 2,470 | $ 2,933
Gain /(Loss) Reclassified from AOCI into Earnings | 130 |  | 242 |
Gain/(Loss) Recognized in AOCI on Derivatives |  | 180 |  | 271
Cash flow hedges |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain/(Loss) Recognized in AOCI on Derivatives |  |  | (272) |
Gain /(Loss) Reclassified from AOCI into Earnings |  |  | 242 |
Gain/(Loss) Recognized in AOCI on Derivatives |  | 180 |  | 271
Gain /(Loss) Reclassified from AOCI into Earnings |  | 86 |  | 259
Foreign currency contracts |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain/(Loss) Recognized in AOCI on Derivatives | (567) |  |  |
Foreign currency contracts | Net revenue |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain /(Loss) Reclassified from AOCI into Earnings | 136 |  |  |
Foreign currency contracts | Cash flow hedges |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain/(Loss) Recognized in AOCI on Derivatives |  |  | (268) |
Gain/(Loss) Recognized in AOCI on Derivatives |  | 180 |  | 271
Foreign currency contracts | Cash flow hedges | Net revenue |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded | 14,294 | 14,603 | 41,381 | 43,349
Gain /(Loss) Reclassified from AOCI into Earnings |  |  | 259 |
Gain /(Loss) Reclassified from AOCI into Earnings |  | 98 |  | 289
Foreign currency contracts | Cash flow hedges | Cost of revenue |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded |  | (11,698) |  | (35,103)
Gain /(Loss) Reclassified from AOCI into Earnings |  | (12) |  | (28)
Foreign currency contracts | Cash flow hedges | Operating expenses |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded |  | (1,826) |  | (5,313)
Gain /(Loss) Reclassified from AOCI into Earnings |  | $ 0 |  | $ (2)
Interest rate contracts |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain/(Loss) Recognized in AOCI on Derivatives | 4 |  |  |
Interest rate contracts | Cost of revenue |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain /(Loss) Reclassified from AOCI into Earnings | (7) |  |  |
Interest rate contracts | Operating expenses |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain /(Loss) Reclassified from AOCI into Earnings | 1 |  |  |
Interest rate contracts | Cash flow hedges |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Gain/(Loss) Recognized in AOCI on Derivatives |  |  | (4) |
Interest rate contracts | Cash flow hedges | Cost of revenue |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded | (11,901) |  | (33,623) |
Gain /(Loss) Reclassified from AOCI into Earnings |  |  | (18) |
Interest rate contracts | Cash flow hedges | Operating expenses |  |  |  |
Pre-tax effect of derivative instruments in cash flow hedging relationships |  |  |  |
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded | $ (1,614) |  | (5,288) |
Gain /(Loss) Reclassified from AOCI into Earnings |  |  | $ 1 |

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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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