Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Current portion of income tax benefit (provision):
Federal		$ (14)	$ 0	$ (10)	$ 0
State		(10)	(7)	(21)	(17)
Foreign		0	(3)	0	(3)
Total current portion		(24)	(10)	(31)	(20)
Deferred portion of income tax benefit (provision):
Federal		11	(6)	4	(13)
State		0	(1)	4	(3)
Total deferred portion		11	(7)	8	(16)
Total provision for income taxes		(13)	$ (17)	(23)	$ (36)
Deferred tax liabilities:
Attributable to investment in OTA		423		423		$ 406
Attributable to property, plant and equipment		127		127		133
Attributable to investments in other entities		5		5		5
Other		60		60		60
Total deferred tax liabilities		615		615		604
Deferred tax assets:
Net operating loss carryovers	[1]	42		42		22
Temporary differences related to Texas Margin Tax		4		4		4
Total deferred tax assets		46		46		26
Valuation allowance		22		22		22
Total deferred tax assets, net of valuation allowance		24		24		4
Total net deferred tax liabilities		$ 591		$ 591		$ 600

[1] The loss amount presented as of June 30, 2023 has an indefinite carryover period.  All losses are subject to limitations on their utilization.