Income Taxes, Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Deferred tax liabilities:
Attributable to investment in OTA	[1]	$ 462	$ 436
Attributable to property, plant and equipment		151	138
Attributable to investments in other entities		5	4
Other		98	83
Total deferred tax liabilities		716	661
Deferred tax assets:
Net operating loss carryovers	[2]	56	46
Temporary differences related to Texas Margin Tax		4	4
Total deferred tax assets		60	50
Total net deferred tax liabilities		$ 656	$ 611

[1] Represents the deferred tax liability balance held by our wholly owned subsidiary, OTA, which we acquired in March 2020.

[2] The loss amount presented as of December 31, 2024 has an indefinite carryover period.  All losses are subject to limitations on their utilization.