General partner loan minimum interest rate offered by partnership.

No definition available.

Name:	ck0000815917_GeneralPartnerLoanMinimumInterestRateOfferedByPartnership
Namespace Prefix:	ck0000815917_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of interest income earned by the partnership on the outstanding amount of partnership loans.

+ References

No definition available.

+ Details

Name:	ck0000815917_InterestIncomeFromOutstandingAmountOfGeneralPartnerLoan
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of limited partnership interests registered for issuance under the Employee Limited Partnership Interest Purchase Plan.

+ References

No definition available.

+ Details

Name:	ck0000815917_LimitedPartnershipAmountRegistered
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of limited partnership interests issued as of the reporting date under the Employee Limited Partnership Interest Purchase Plan.

+ References

No definition available.

+ Details

Name:	ck0000815917_LimitedPartnershipInterestsIssued
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of return on the face amount of limited partnership capital for the reporting period.

+ References

No definition available.

+ Details

Name:	ck0000815917_LimitedPartnershipMinimumReturnValue
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The minimum annual return rate on the face amount of limited partnership capital.

+ References

No definition available.

+ Details

Name:	ck0000815917_LimitedPartnershipsMinimumAnnualPaymentRate
Namespace Prefix:	ck0000815917_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Partner’s capital account.

+ References

No definition available.

+ Details

Name:	ck0000815917_PartnersCapitalAccountLineItems
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of partnership loans outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	ck0000815917_PartnershipLoansOutstanding
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time loans are generally offered by the partnership to those general partners who require financing for some or all of their general partner interests.

+ References

No definition available.

+ Details

Name:	ck0000815917_PeriodOfLoansMadeByPartnershipToGeneralPartners
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Remaining amount of limited partnership interests available to be issued under the Employee Limited Partnership Interest Purchase Plan.

+ References

No definition available.

+ Details

Name:	ck0000815917_RemainingLimitedPartnershipInterestsThatMayBeIssued
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CapitalUnitsByClassAxis=ck0000815917_TwoThousandTwentyOneLimitedPartnershipOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Partnership Capital Subject to Mandatory Redemption - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 08, 2021
Partners Capital Account [Line Items]
Period of loans made by Partnership to general partners			1 year
Percentage of interest made by partnership to general partners			3.25%
Partnership loans outstanding	$ 514	$ 464	$ 514	$ 464	$ 439	$ 335
Interest income from outstanding amount of general partner loan	12	10	$ 36	$ 30
Limited partnership's minimum annual return rate			7.50%	7.50%
Limited partnership's minimum return, value	32	$ 33	$ 98	$ 99
Private Placement [Member]
Partners Capital Account [Line Items]
Limited partnership interests issued	7		7
Two Thousand Twenty One Limited Partnership Offering [Member]
Partners Capital Account [Line Items]
Limited partnership amount registered							$ 700
Limited partnership interests issued	568		568
Remaining limited partnership interests that may be issued	$ 132		$ 132