Lines of Credit - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Oct. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Line Of Credit Facility [Line Items]
Line of credit facility		$ 890	$ 890
Minimum Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans		4,049	3,355
2022 Credit Facility [Member]
Line Of Credit Facility [Line Items]
Committed Revolving Line of Credits	$ 500
Line of credit facility		500	500
Maximum leverage ratio required to be maintained by partnership	35.00%
Minimum Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans	$ 2,809
Minimum tangible net worth	$ 1,349
Minimum regulatory net capital percentage of debit items	6.00%
Amounts outstanding		0
Uncommitted Secured Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Line of credit facility		390	390
Amounts outstanding		0	0
Partnership draws against lines of credit		$ 0	$ 0