Partnership Capital Subject to Mandatory Redemption - Roll Forward of Outstanding Partnership Loans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Partners' Capital Notes [Abstract]
Partnership loans outstanding at beginning of year	$ 321	$ 341	$ 360
Partnership loans issued during the year	276	222	163
Repayment of Partnership loans during the year	(262)	(242)
Partnership loans outstanding at end of year	$ 335	$ 321	$ 341