Supplemental Oil and Gas Disclosures (Unaudited) (Results of Operations for Oil and Gas Producing Activities Disclosure) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Sales	$ 4,109	$ 10,577	$ 4,640
Production (lifting) costs	(1,990)	(1,969)	(1,304)
Depreciation, depletion and amortization	(1,302)	(1,169)	(537)
Impairment of natural gas and oil properties	(1,710)	0	0
Results of operations - income before income taxes	(893)	7,439	2,799
Provision for income taxes	(200)	0	0
Results of operations	$ (693)	$ 7,439	$ 2,799