Summary of Significant Accounting Policies, Part 3 (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Environmental Reserves [Abstract]
Environmental reserves		$ 9	$ 4
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		50	20	$ 41
Impairment charges in operating costs and expenses		57	30	53
Total asset impairment charges		57	32	53
Operating costs and expenses [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		50	18	41
Other impairments	[1]	7	12	12
Impairment charges in operating costs and expenses	[2]	57	30	53
General and administrative costs [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment	[3]	$ 0	$ 2	$ 0

[1] Primarily represents the write-down of surplus materials classified as “Other assets” on our Consolidated Balance Sheets.

[2] Amounts presented are a component of “Third party and other costs” within the “Operating costs and expenses” section of our Statements of Consolidated Operations.

[3] Amounts presented are a component of “Third party and other costs” within the “General and administrative costs” section of our Statements of Consolidated Operations.