Regulatory Requirements - Narrative (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Brokers and Dealers [Abstract]
Standardized (as a percent)	0	0
Minimum tier 1 leverage ratio (as a percent)	4.00%
Minimum Tier 1 SLR requirement (as a percent)	3.00%
Minimum enhanced SLR capital buffer (as a percent)	2.00%