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Supplementary Financial Information - Trade Receivables Sold and Cash Received (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Receivables Sold but Not Collected from Third Party
Balance at beginning of year	$ 147	$ 149	$ 93
Trade receivables sold	10,224	9,553	8,222
Cash receipts	(10,202)	(9,562)	(8,160)
Foreign currency and other	(4)	7	(6)
Balance at end of year	$ 165	$ 147	$ 149

X

- Definition

The aggregate amount of cash receipts under revolving financing receivables arrangements facilities during the reporting period.

+ References

No definition available.

+ Details

Name:	hpq_CashReceipts
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate amount of FX and other under revolving financing receivables arrangements facilities during the reporting period.

+ References

No definition available.

+ Details

Name:	hpq_FxAndOther
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of receivables sold to the third party, but not collected by the third party from customer under revolving financing receivables arrangements.

+ References

No definition available.

+ Details

Name:	hpq_ReceivablesSoldButNotCollectedFromThirdParty
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Receivables Sold but Not Collected from Third Party [Roll Forward]

+ References

No definition available.

+ Details

Name:	hpq_ReceivablesSoldbutNotCollectedfromThirdPartyRollForward
Namespace Prefix:	hpq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate face amount of accounts receivable that were sold to third party under revolving financing receivables arrangements during the reporting period.

+ References

No definition available.

+ Details

Name:	hpq_TradeReceivablesSold
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration