Lines of Credit - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 29, 2013
Line of Credit Facility [Line Items]
Line of credit facility		$ 790,000,000	$ 690,000,000
2013 Credit Facility [Member]
Line of Credit Facility [Line Items]
Expiry of unsecured revolving line of credit, month and year		2018-11
Line of credit facility			400,000,000		$ 400,000,000
Amount outstanding under credit facility		$ 0	0
Partnership draws against lines of credit		0	0	$ 0
2018 Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility	$ 500,000,000	500,000,000
Maximum leverage ratio required to be maintained by partnership	35.00%
Required minimum partnership capital, net of reserve for anticipated withdrawals and partnership loans	$ 1,884,000,000
Amount outstanding under credit facility		0
Partnership draws against lines of credit		0
2018 Credit Facility [Member] | Edward D. Jones & Co., L. P [Member]
Line of Credit Facility [Line Items]
Minimum tangible net worth	$ 1,344,000,000
Minimum regulatory capital percentage of debit items	6.00%
Uncommitted Secured Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility		290,000,000	290,000,000
Amount outstanding under credit facility		0	0
Partnership draws against lines of credit		$ 0	$ 0	$ 0