Summary of Significant Accounting Policies, Part 3 (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		$ 20	$ 41	$ 218
Impairment charges in operating costs and expenses		30	53	233
Total asset impairment charges		32	53	233
Environmental Reserves [Member]
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period		3
Balance at end of period		4	3
Operating costs and expenses [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment		18	41	218
Other impairments	[1]	12	12	15
Impairment charges in operating costs and expenses	[2]	30	53	233
General and administrative costs [Member]
Asset Impairment Charges [Abstract]
Impairment of property, plant and equipment	[3]	$ 2	$ 0	$ 0

[1] Primarily represents the write-down of surplus materials classified as current assets and intangible assets other than goodwill.

[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.