Supplemental Oil and Gas Disclosures (Unaudited) (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Mcfe	Dec. 31, 2021 USD ($) Mcfe	Dec. 31, 2020 USD ($) Mcfe location	Dec. 31, 2019 Mcfe
Natural Gas and Oil Properties [Line Items]
Capitalized interest based on weighted average cost of borrowings | $	$ 121	$ 97	$ 88
Capitalized internal costs related to acquisition, exploration and development | $	$ 85	$ 64	$ 56
Percentage of present worth of proved reserves evaluated in audit	99.00%	99.00%	97.00%
Proved reserves, end of period, (bcfe)	21,625,000,000	21,148,000,000	11,990,000,000	12,721,000,000
Proved undeveloped reverses (energy)	0	0	2,437,000,000
Number of locations | location			138
Present value of proved reserves, discounted basis | $			$ 207
United States
Natural Gas and Oil Properties [Line Items]
Proved reserves, end of period, (bcfe)	21,625,000,000	21,148,000,000	11,990,000,000	12,721,000,000
Proved undeveloped reverses (energy)	9,480,000,000	9,813,000,000	3,787,000,000