Segment Information - Financial Information for Partnership's Reportable Segments (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Advisor	Dec. 31, 2020 USD ($) Advisor	Dec. 31, 2019 USD ($) Advisor
Net revenue:
Total net revenue	$ 12,279	$ 10,063	$ 9,369
Net interest and dividends revenue:
Total net interest and dividends revenue	73	105	259
Pre-variable income:
Total pre-variable income	3,554	2,699	2,210
Variable compensation:
Total variable compensation	1,949	1,414	1,118
Income (loss) before allocations to partners:
Total income before allocations to partners	1,605	1,285	1,092
Capital expenditures:
Total capital expenditures	234	129	176
Depreciation and amortization:
Depreciation and amortization	461	443	432
Total assets at year end:
Total assets	$ 32,208	$ 28,854	$ 19,777
Financial advisors at year end:
Total financial advisors | Advisor	18,823	19,225	18,704
United States [Member]
Net revenue:
Total net revenue	$ 11,946	$ 9,805	$ 9,127
Net interest and dividends revenue:
Total net interest and dividends revenue	69	99	249
Pre-variable income:
Total pre-variable income	3,489	2,673	2,194
Variable compensation:
Total variable compensation	1,907	1,385	1,094
Income (loss) before allocations to partners:
Total income before allocations to partners	1,582	1,288	1,100
Capital expenditures:
Total capital expenditures	229	126	170
Depreciation and amortization:
Depreciation and amortization	445	428	421
Total assets at year end:
Total assets	$ 31,034	$ 27,776	$ 19,025
Financial advisors at year end:
Total financial advisors | Advisor	17,971	18,321	17,830
Canada [Member]
Net revenue:
Total net revenue	$ 333	$ 258	$ 242
Net interest and dividends revenue:
Total net interest and dividends revenue	4	6	10
Pre-variable income:
Total pre-variable income	65	26	16
Variable compensation:
Total variable compensation	42	29	24
Income (loss) before allocations to partners:
Total income before allocations to partners	23	(3)	(8)
Capital expenditures:
Total capital expenditures	5	3	6
Depreciation and amortization:
Depreciation and amortization	16	15	11
Total assets at year end:
Total assets	$ 1,174	$ 1,078	$ 752
Financial advisors at year end:
Total financial advisors | Advisor	852	904	874