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Fair Value (Tables) | 6 Months Ended
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Apr. 30, 2021
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis | The following table presents HP’s assets and liabilities that are measured at fair value on a recurring basis:
| As of April 30, 2021 |  | As of October 31, 2020
| Fair Value Measured Using |  |  |  | Fair Value Measured Using |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| In millions
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt | $ | — |  |  | $ | 1,374 |  |  | $ | — |  |  | $ | 1,374 |  |  | $ | — |  |  | $ | 1,700 |  |  | $ | — |  |  | $ | 1,700 |
Financial institution instruments | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 59 |  |  | — |  |  | 59 |
Government debt(1) | 931 |  |  | — |  |  | — |  |  | 931 |  |  | 1,992 |  |  | 181 |  |  | — |  |  | 2,173 |
Available-for-Sale Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 169 |  |  | — |  |  | 169 |
Financial institution instruments | — |  |  | 12 |  |  | — |  |  | 12 |  |  | — |  |  | 32 |  |  | — |  |  | 32 |
Government debt(1) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 73 |  |  | — |  |  | 73 |
Mutual funds | 6 |  |  | 57 |  |  | — |  |  | 63 |  |  | 5 |  |  | 53 |  |  | — |  |  | 58 |
Derivative Instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts | — |  |  | 2 |  |  | — |  |  | 2 |  |  | — |  |  | 4 |  |  | — |  |  | 4 |
Foreign currency contracts | — |  |  | 93 |  |  | — |  |  | 93 |  |  | — |  |  | 191 |  |  | — |  |  | 191 |
Other derivatives | — |  |  | 2 |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |
Total assets | $ | 937 |  |  | $ | 1,540 |  |  | $ | — |  |  | $ | 2,477 |  |  | $ | 1,997 |  |  | $ | 2,462 |  |  | $ | — |  |  | $ | 4,459 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contracts | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 3 |
Foreign currency contracts | — |  |  | 343 |  |  | — |  |  | 343 |  |  | — |  |  | 256 |  |  | — |  |  | 256 |
Other derivatives | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Total liabilities | $ | — |  |  | $ | 352 |  |  | $ | — |  |  | $ | 352 |  |  | $ | — |  |  | $ | 262 |  |  | $ | — |  |  | $ | 262 |
(1) Government debt includes instruments such as U.S. treasury notes, U.S. agency securities and non-U.S. government bonds. Money market funds invested in government debt and traded in active markets are included in Level 1.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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