As of June 25, 2021 and December 31, 2020, collateral held for receivables from clients was $4,400 and $4,035, respectively, and collateral held for securities purchased under agreements to resell was $1,101 and $1,743, respectively. As the fair value of the collateral either exceeded or was at least 100% of the amortized cost, the expected credit loss was zero for each period. Additionally, partnership loan values remained below the value of capital allocated to partners, resulting in an expected credit loss of zero as of June 25, 2021 and December 31, 2020.

As of June 25, 2021, December 31, 2020 and December 31, 2019, $647, $563 and $470, respectively, of the receivable from clients balance and $325, $285 and $291, respectively, of the receivable from mutual funds, insurance companies and other balance related to revenue contracts with customers. The related fees are paid out of client accounts or third-party products consisting of cash and securities, and the collateral value of those accounts continues to exceed the amortized cost basis of these receivables, resulting in a remote risk of loss. The expected credit loss for receivables from contracts with customers was zero as of June 25, 2021 and December 31, 2020.

The Partnership derived 11% and 12% of its total revenue for the three- and six-month periods ended June 25, 2021, respectively, and 13% and 14% of its total revenue for the three- and six-month periods ended June 26, 2020, respectively, from one mutual fund company. The revenue generated from this company relates to business conducted with the Partnership's U.S. segment.

The following table shows the Partnership's disaggregated revenue information. See Note 8 for segment information.

	Three Months Ended June 25, 2021						Three Months Ended June 26, 2020
	U.S.		Canada		Total		U.S.		Canada		Total
Fee revenue:
Asset-based fee revenue:
Advisory programs fees	$	1,782	$	31	$	1,813	$	1,238	$	20	$	1,258
Service fees		388		29		417		304		19		323
Other asset-based fees		155		—		155		137		—		137
Total asset-based fee revenue		2,325		60		2,385		1,679		39		1,718
Account and activity fee revenue:
Shareholder accounting services fees		109		—		109		104		—		104
Other account and activity fee revenue		59		3		62		53		3		56
Total account and activity fee revenue		168		3		171		157		3		160
Total fee revenue		2,493		63		2,556		1,836		42		1,878
Trade revenue:
Commissions		412		14		426		364		14		378
Principal transactions		10		1		11		16		1		17
Total trade revenue		422		15		437		380		15		395
Total revenue from customers		2,915		78		2,993		2,216		57		2,273
Net interest and dividends and other revenue		39		2		41		45		7		52
Net revenue	$	2,954	$	80	$	3,034	$	2,261	$	64	$	2,325


	Six Months Ended June 25, 2021						Six Months Ended June 26, 2020
	U.S.		Canada		Total		U.S.		Canada		Total
Fee revenue:
Asset-based fee revenue:
Advisory programs fees	$	3,422	$	58	$	3,480	$	2,519	$	39	$	2,558
Service fees		754		54		808		620		43		663
Other asset-based fees		306		—		306		303		—		303
Total asset-based fee revenue		4,482		112		4,594		3,442		82		3,524
Account and activity fee revenue:
Shareholder accounting services fees		216		—		216		213		—		213
Other account and activity fee revenue		118		7		125		112		6		118
Total account and activity fee revenue		334		7		341		325		6		331
Total fee revenue		4,816		119		4,935		3,767		88		3,855
Trade revenue:
Commissions		831		28		859		828		27		855
Principal transactions		19		1		20		31		2		33
Total trade revenue		850		29		879		859		29		888
Total revenue from customers		5,666		148		5,814		4,626		117		4,743
Net interest and dividends and other revenue		67		6		73		58		15		73
Net revenue	$	5,733	$	154	$	5,887	$	4,684	$	132	$	4,816