Segment Information - Financial Information for Partnership's Reportable Segments (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Advisor	Dec. 31, 2022 USD ($) Advisor	Dec. 31, 2021 USD ($) Advisor
Net revenue
Total net revenue	$ 13,798	$ 12,269	$ 12,279
Net interest and dividends revenue:
Total net interest and dividends revenue	885	372	73
Pre-variable income:
Total pre-variable income	3,450	3,139	3,554
Variable compensation:
Total variable compensation	1,838	1,735	1,949
Income before allocations to partners:
Income before allocations to partners	(1,612)	(1,404)	(1,605)
Capital expenditures:
Total capital expenditures	456	302	234
Total capital expenditures	456	302	234
Depreciation and amortization:
Depreciation and amortization	567	499	461
Total assets at year end:
Total assets	$ 28,003	$ 29,892	$ 32,208
Financial advisors at year end:
Total financial advisors | Advisor	19,232	18,796	18,823
United States [Member]
Net revenue
Total net revenue	$ 13,409	$ 11,902	$ 11,946
Net interest and dividends revenue:
Total net interest and dividends revenue	841	354	69
Pre-variable income:
Total pre-variable income	3,367	3,057	3,489
Variable compensation:
Total variable compensation	1,798	1,694	1,907
Income before allocations to partners:
Income before allocations to partners	1,569	1,363	1,582
Capital expenditures:
Total capital expenditures	450	298	229
Depreciation and amortization:
Depreciation and amortization	552	483	445
Total assets at year end:
Total assets	$ 26,926	$ 28,761	$ 31,034
Financial advisors at year end:
Total financial advisors | Advisor	18,378	17,961	17,971
Canada [Member]
Net revenue
Total net revenue	$ 389	$ 367	$ 333
Net interest and dividends revenue:
Total net interest and dividends revenue	44	18	4
Pre-variable income:
Total pre-variable income	83	82	65
Variable compensation:
Total variable compensation	40	41	42
Income before allocations to partners:
Income before allocations to partners	43	41	23
Capital expenditures:
Total capital expenditures	6	4	5
Depreciation and amortization:
Depreciation and amortization	15	16	16
Total assets at year end:
Total assets	$ 1,077	$ 1,131	$ 1,174
Financial advisors at year end:
Total financial advisors | Advisor	854	835	852