Consolidated Statements of Changes in Partnership Capital Subject to Mandatory Redemption - USD ($) $ in Millions	Total	Limited Partnership Capital [Member]	Subordinated Limited Partnership Capital [Member]	General Partnership Capital [Member]
TOTAL PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION at Dec. 31, 2019	$ 3,364	$ 1,359	$ 566	$ 1,439
Reserve for anticipated withdrawals at Dec. 31, 2019	(407)	(110)	(43)	(254)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals at Dec. 31, 2019	2,957	1,249	523	1,185
Partnership loans outstanding at beginning of year at Dec. 31, 2019	360		4	356
Total partnership capital, including capital financed with partnership loans, net of reserve for anticipated withdrawals at Dec. 31, 2019	3,317	1,249	527	1,541
Issuance of partnership interests	213	1	49	163
Redemption of partnership interests	(81)	(3)	(35)	(43)
Income allocated to partners	303	50	35	218
Distributions	(5)			(5)
Total partnership capital, including capital financed with partnership loans at Mar. 27, 2020	3,747	1,297	576	1,874
Redemption of partnership interests	(6)	(3)	(1)	(2)
Income allocated to partners	288	42	34	212
Distributions	(349)	(14)	(58)	(277)
Total partnership capital, including capital financed with partnership loans at Jun. 26, 2020	3,680	1,322	551	1,807
Redemption of partnership interests	(13)	(4)	(1)	(8)
Income allocated to partners	316	45	37	234
Distributions	(208)		(35)	(173)
Total partnership capital, including capital financed with partnership loans at Sep. 25, 2020	3,775	1,363	552	1,860
Partnership loans outstanding, reduction to arrive at Partnership Capital at Sep. 25, 2020	363		1	362
TOTAL PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION at Sep. 25, 2020	3,412	1,363	551	1,498
Reserve for anticipated withdrawals at Sep. 25, 2020	(254)	(123)	(13)	(118)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals at Sep. 25, 2020	3,158	1,240	538	1,380
TOTAL PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION at Dec. 31, 2020	3,589	1,362	594	1,633
Reserve for anticipated withdrawals at Dec. 31, 2020	(514)	(125)	(56)	(333)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals at Dec. 31, 2020	3,075	1,237	538	1,300
Partnership loans outstanding at beginning of year at Dec. 31, 2020	341	0	1	340
Total partnership capital, including capital financed with partnership loans, net of reserve for anticipated withdrawals at Dec. 31, 2020	3,416	1,237	539	1,640
Issuance of partnership interests	274	3	60	211
Redemption of partnership interests	(71)	(5)	(16)	(50)
Income allocated to partners	380	49	46	285
Distributions	(3)	0	0	(3)
Total partnership capital, including capital financed with partnership loans at Mar. 26, 2021	3,996	1,284	629	2,083
Issuance of partnership interests	11	2	0	9
Redemption of partnership interests	(13)	(5)	0	(8)
Income allocated to partners	443	58	52	333
Distributions	(489)	(10)	(82)	(397)
Total partnership capital, including capital financed with partnership loans at Jun. 25, 2021	3,948	1,329	599	2,020
Issuance of partnership interests	3		1	2
Redemption of partnership interests	(34)	(4)	(3)	(27)
Income allocated to partners	400	52	47	301
Distributions	(288)	(1)	(47)	(240)
Total partnership capital, including capital financed with partnership loans at Sep. 24, 2021	4,029	1,376	597	2,056
Partnership loans outstanding, reduction to arrive at Partnership Capital at Sep. 24, 2021	336	0	0	336
TOTAL PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION at Sep. 24, 2021	3,693	1,376	597	1,720
Reserve for anticipated withdrawals at Sep. 24, 2021	(317)	(148)	(16)	(153)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals at Sep. 24, 2021	$ 3,376	$ 1,228	$ 581	$ 1,567