Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	$ 953,766	$ 1,166,409	$ 2,606,584	$ 3,234,021
Gain (loss) on derivative instruments	0	115,191	0	(308,654)
Gain on sale of assets and other income	5,879	21,825	9,365	32,076
Total revenues and other income	959,645	1,303,425	2,615,949	2,957,443
Revenue from production
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	945,889	1,120,909	2,541,956	3,101,736
Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	822,493	909,146	2,196,713	2,581,766
Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	23,400	39,299	69,360	115,986
Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	99,996	172,464	275,883	403,984
Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	7,877	45,500	64,628	132,285
United States Onshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	207,448	247,562	514,614	684,099
United States Onshore | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	9,953	18,288	24,763	53,035
United States Onshore | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	6,035	21,009	15,623	51,412
United States Offshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	568,721	597,242	1,549,872	1,675,389
United States Offshore | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	10,908	16,079	37,078	48,151
United States Offshore | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	18,377	52,143	55,311	121,911
United States Offshore | Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	0	0	0	181
Canada Onshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	20,610	29,445	61,868	106,559
Canada Onshore | Net natural gas liquids revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	2,539	4,932	7,519	14,800
Canada Onshore | Net natural gas revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	75,584	99,312	204,949	230,661
Canada Onshore | Sales of purchased natural gas
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	7,877	45,500	64,628	132,104
Canada Offshore | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	22,272	30,030	63,273	97,216
Other | Net crude oil and condensate revenue
Disaggregation of Revenue [Line Items]
Total revenue from sales to customers	$ 3,442	$ 4,867	$ 7,086	$ 18,503