Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 94	$ 103	$ 157
Cash paid for taxes	13	11	10
Non-cash activities:
Issuance of general partnership interests through partnership loans in current year	222	163	164
Repayment of partnership loans through distributions from partnership capital in current year	225	182	136
Declared distributions for retired partnership capital in current year but unpaid at year end	$ 254	$ 145	$ 113