Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Current portion of income tax benefit (provision):
Federal		$ 4	$ 0
State		(11)	(10)
Total current portion		(7)	(10)
Deferred portion of income tax benefit (provision):
Federal		(7)	(7)
State		4	(2)
Total deferred portion		(3)	(9)
Total provision for income taxes		(10)	$ (19)
Deferred tax liabilities:
Attributable to investment in OTA		415		$ 406
Attributable to property, plant and equipment		127		133
Attributable to investments in other entities		5		5
Other		60		60
Total deferred tax liabilities		607		604
Deferred tax assets:
Net operating loss carryovers	[1]	22		22
Temporary differences related to Texas Margin Tax		4		4
Total deferred tax assets		26		26
Valuation allowance		22		22
Total deferred tax assets, net of valuation allowance		4		4
Total net deferred tax liabilities		$ 603		$ 600

[1] The loss amount presented as of March 31, 2023 has an indefinite carryover period.  All losses are subject to limitations on their utilization.