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Cover - USD ($)
 12 Months Ended
Oct. 31, 2019
Jan. 31, 2020
Apr. 30, 2019
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description On December 12, 2019, HP Inc. filed its Annual Report on Form 10-K for the fiscal year ended October 31, 2019 (the "Original Form 10-K"). HP Inc. is filing this Amendment No. 1 on Form 10-K/A (the "Form 10-K/A") because it will not file its definitive proxy statement within 120 days after the end of its fiscal year ended October 31, 2019. This Form 10-K/A amends and restates in its entirety Part III, Items 10 through 14 of the Original Form 10-K, to include information previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K. The reference on the cover page of the Original Form 10-K to the incorporation by reference of portions of HP Inc.'s definitive proxy statement into Part III of the Original Form 10-K is hereby deleted. In this Form 10-K/A, unless the context indicates otherwise, the designations "HP," the "Company," "we," "us" or "our" refer to HP Inc. and its consolidated subsidiaries. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), certifications by HP's principal executive officer and principal financial officer are filed as exhibits to this Form 10-K/A under Item 15 of Part IV hereof. Because no financial statements have been included in this Form 10-K/A and this Form 10-K/A does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. We are not including the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Form 10-K/A.    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Oct. 31, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Current Fiscal Year End Date --10-31    
Entity File Number 1-4423    
Entity Registrant Name HP INC.    
Entity Central Index Key 0000047217    
Entity Tax Identification Number 94-1081436    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 1501 Page Mill Road    
Entity Address, City or Town Palo Alto    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94304    
City Area Code 650    
Local Phone Number 857-1501    
Title of 12(b) Security Common stock, par value $0.01 per share    
Trading Symbol HPQ    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 30,007,738,276
Entity Common Stock, Shares Outstanding   1,433,345,730  
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