Fair Value (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Partnership's Financial Assets at Fair Value

The following tables show the Partnership's financial instruments measured at fair value:

	Financial Assets at Fair Value as of
	December 31, 2020
	Level I		Level II		Level III		Total
Cash equivalents:
Certificates of deposit	$	—	$	120	$	—	$	120
Money market funds	41			—		—	41
Total cash equivalents	$	41	$	120	$	—	$	161
Investments segregated under federal regulations:
U.S. treasuries	$	12,051	$	—	$	—	$	12,051
Certificates of deposit		—		100		—		100
Total investments segregated under federal regulations	$	12,051	$	100	$	—	$	12,151
Securities owned:
Investment securities:
Government and agency obligations	$	971	$	—	$	—	$	971
Mutual funds(1)		327		—		—		327
Equities		3		—		—		3
Certificates of deposit		—		1		—		1
Total investment securities	$	1,301	$	1	$	—	$	1,302
Inventory securities:
Equities	$	19	$	—	$	—	$	19
State and municipal obligations		—		10		—		10
Corporate bonds and notes		—		2		—		2
Mutual funds		1		—		—		1
Total inventory securities	$	20	$	12	$	—	$	32

	Financial Assets at Fair Value as of
	December 31, 2019
	Level I		Level II		Level III		Total
Cash equivalents:
Certificates of deposit	$	—	$	326	$	—	$	326
Investments segregated under federal regulations:
U.S. treasuries	$	3,394	$	—	$	—	$	3,394
Securities owned:
Investment securities:
Mutual funds(1)	$	328	$	—	$	—	$	328
Government and agency obligations		3		—		—		3
Equities		1		—		—		1
Total investment securities	$	332	$	—	$	—	$	332
Inventory securities:
Equities	$	18	$	—	$	—	$	18
State and municipal obligations		—		18		—		18
Certificates of deposit		—		9		—		9
Corporate bonds and notes		—		3		—		3
Mutual funds		2		—		—		2
Total inventory securities	$	20	$	30	$	—	$	50

⁽¹⁾ The mutual funds balance consists primarily of securities held to economically hedge future liabilities related to the non-qualified deferred compensation plan. The balance also includes a security held for regulatory purposes at the Trust Co.