Supplemental Oil and Gas Disclosures (Unaudited) (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Mcfe	Dec. 31, 2022 USD ($) Mcfe	Dec. 31, 2021 USD ($) Mcfe	Dec. 31, 2020 Mcfe
Natural Gas and Oil Properties [Line Items]
Capitalized interest based on weighted average cost of borrowings | $	$ 115	$ 121	$ 97
Capitalized internal costs related to acquisition, exploration and development | $	$ 85	$ 85	$ 64
Percentage of present worth of proved reserves evaluated in audit	99.00%	99.00%	99.00%
Proved reserves, end of period, (bcfe)	19,660,000,000	21,625,000,000	21,148,000,000	11,990,000,000
Proved undeveloped reverses (energy)	2,548,000,000	0
United States
Natural Gas and Oil Properties [Line Items]
Proved reserves, end of period, (bcfe)	19,660,000,000	21,625,000,000	21,148,000,000	11,990,000,000
Proved undeveloped reverses (energy)	8,055,000,000	9,480,000,000	9,813,000,000