Partnership Capital Subject to Mandatory Redemption - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 11, 2022	Dec. 08, 2021	Dec. 31, 2018	Jan. 12, 2018
Partners Capital Account [Line Items]
Period of loans made by Partnership to general partners	1 year
Percentage of interest made by partnership to general partners	3.25%
Outstanding amount of partner loans financed through the Partnership	$ 321	$ 341	$ 360			$ 332
Interest income from outstanding amount of general partner loan	$ 13	$ 14	$ 21
Limited partnership's minimum annual return rate	7.50%	7.50%	7.50%
Limited partnership's minimum return, value	$ 92	$ 93	$ 94
2018 Limited Partnership Offering [Member]
Partners Capital Account [Line Items]
Limited partnership amount registered							$ 450
Limited partnership interests issued	5	$ 1	$ 380
Remaining limited partnership interests that may be issued	$ 60
2018 Limited Partnership Offering [Member] | Subsequent Event [Member]
Partners Capital Account [Line Items]
Limited partnership interests issued				$ 4
2021 Limited Partnership Offering [Member]
Partners Capital Account [Line Items]
Remaining limited partnership interests that may be issued					$ 700