Receivable from Mutual Funds, Insurance Companies, and Other - Composition of Partnership's Receivable from Mutual Funds, Insurance Companies and Other (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Brokers And Dealers [Abstract]
Deposit for Canadian retirement accounts	$ 326	$ 273
Fees from mutual fund and insurance companies	291	278	$ 279
Other receivables	44	4
Total	$ 661	$ 555

Amount due from mutual funds, insurance companies and other for fees and charges arising from transactions related to the entity's brokerage activities and operations.

No definition available.

Name:	ck0000815917_ReceivableFromMutualFundsInsuranceCompaniesAndOther
Namespace Prefix:	ck0000815917_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant