Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Deferred tax liabilities:
Property, plant and equipment	$ (1,464,000,000)	$ (1,414,000,000)
Intangible assets	(95,000,000)	(114,000,000)
Other	(50,000,000)	(54,000,000)
Total deferred tax liabilities	(1,609,000,000)	(1,582,000,000)
Deferred tax assets:
Payable to affiliate due to post-retirement benefit plan participation	292,000,000	302,000,000
Gross deferred tax assets	292,000,000	302,000,000
Less valuation allowance on deferred tax assets	0	0
Net deferred tax assets	292,000,000	302,000,000
Net deferred tax liabilities	$ (1,317,000,000)	$ (1,280,000,000)