Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Additional Information (Detail) Bcfe in Thousands, $ in Billions		12 Months Ended
		Dec. 31, 2021 USD ($) MMcfe Bcfe $ / bbl $ / Mcf $ / MMBTU MMBbls MMcf	Dec. 31, 2020 MMcfe $ / bbl $ / Mcf $ / MMBTU MMBbls MMcf	Dec. 31, 2019 MMcfe $ / bbl $ / Mcf $ / MMBTU MMcf MMBbls MBbls	Dec. 31, 2018 MMcfe MMBbls MMcf
Reserve Quantities [Line Items]
Percentage of proved resources reviewed by consultants		97.00%
Proved reserve and pretax present value of reserve discounted		10.00%
Variance in reserve estimates		less than 5%.
Scheduled to be drilling period maximum for undeveloped reserves		scheduled to be drilled within five years
Reserve additions attributable to natural gas		72.00%	80.00%	83.00%
Proved undeveloped reserves dropped		1,300	961,100	601,300
Revision of negative pricing			67,900	17,800
Revisions of positive pricing		22,600
Estimated future development costs over next five years | $		$ 2.2
Proved undeveloped reserves reported for more than five years | Bcfe		21
Crude Oil and NGL
Reserve Quantities [Line Items]
Benchmark price used for calculating average realized prices | $ / bbl		66.34	39.77	55.73
Crude Oil and Condensate
Reserve Quantities [Line Items]
Estimate reserve information average realized prices | $ / bbl		59.35	30.13	49.24
Proved developed and undeveloped reserves | MMBbls		52,596	57,626	74,532	85,856
NGLs
Reserve Quantities [Line Items]
Estimate reserve information average realized prices | $ / bbl		28.41	16.14	17.32
Proved developed and undeveloped reserves | MMBbls		1,001,305	951,466	938,236	921,594
Natural Gas
Reserve Quantities [Line Items]
Estimate reserve information average realized prices | $ / Mcf		3.30	1.68	2.38
Proved developed and undeveloped reserves | MMcf		11,452,081	11,148,560	12,114,977	12,027,702
Natural Gas, Per Thousand Cubic Feet
Reserve Quantities [Line Items]
Benchmark price used for calculating average realized prices | $ / MMBTU		3.60	1.98	2.58
Natural Gas Equivalents
Reserve Quantities [Line Items]
Proved reserves from drilling activities and evaluations of proved areas	[1]	1,602,769	1,264,282	1,161,274
Proved developed and undeveloped reserve balances	[1]	17,775,484	17,203,114	18,191,583	18,072,406
Revisions of previous estimates	[1]	(252,876)	(608,211)	303,068
Revision of positive performance		1,000.0	420,900	922,200
Ethane and Natural Gas Equivalents
Reserve Quantities [Line Items]
Proved developed and undeveloped reserve balances				2,102,000
Proved developed and undeveloped reserves | MBbls				475,000.0
Maximum
Reserve Quantities [Line Items]
Statement that reserve estimates differ from auditors		0.10

[1] Oil and NGLs volumes are converted to mcfe at the rate of one barrel equals six mcf based upon the approximate relative energy content of oil to natural gas, which is not indicative of the relationship between oil and natural gas prices.