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	0	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)	0	0	(5)
Total partnership capital, including capital financed with partnership loans at Mar. 27, 2020	3,747	1,297	576	1,874
Partnership loans outstanding, reduction to arrive at Partnership Capital at Mar. 27, 2020	(423)	0	(1)	(422)
TOTAL PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION at Mar. 27, 2020	3,324	1,297	575	1,452
Reserve for anticipated withdrawals at Mar. 27, 2020	(268)	(50)	(35)	(183)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals at Mar. 27, 2020	3,056	1,247	540	1,269
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
Partnership loans outstanding, reduction to arrive at Partnership Capital at Mar. 26, 2021	(438)	0	0	(438)
TOTAL PARTNERSHIP CAPITAL SUBJECT TO MANDATORY REDEMPTION at Mar. 26, 2021	3,558	1,284	629	1,645
Reserve for anticipated withdrawals at Mar. 26, 2021	(337)	(49)	(46)	(242)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals at Mar. 26, 2021	$ 3,221	$ 1,235	$ 583	$ 1,403