Property, Plant And Equipment And Asset Retirement Obligations (Asset Retirement Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at January 1	$ 12,989	$ 10,491	$ 10,630
Accretion expense and other provisions	709	734	744
Reduction due to property sales	(1,445)	(288)	(328)
Payments made	(1,191)	(693)	(518)
Liabilities incurred	533	831	119
Foreign currency translation	(447)	124	(330)
Revisions	884	1,790	174
Balance at December 31	$ 12,032	$ 12,989	$ 10,491